передача значения из одного input в другой

function inputChangeTwoOther(){ 
                var a = document.getElementById("inputChangeTwoFst"); 
                var m = document.getElementById("inputChangeTwoSec"); 
                var n = m.value; 
                var v = a.value; 
                m.value = v; 
                a.value = n; 
            } 
     
            function inputCsss(){ 
                var a =document.getElementById("inputCsss"); 
                a.value = "my css: www eee aaa"; 
            } 
     
            function inputMove() { 
                var a = document.getElementById("inputMove") 
                var w = document.getElementById("submitMove") 
                a.style.right ="5px"; 
                w.style.left ="5px"; 
     
            } 
     
            function submitClick() { 
                var a = document.getElementById("submitClick"); 
                aaa++; 
                a.value = aaa; 
            } 
     
            function submitBlock() { 
                var a = document.getElementById("submitBlock"); 
                a.disabled = true; 
                aa.style.display = "inline"; 
     
            } 
     
            function submitUnblock() { 
                var a = document.getElementById("submitBlock"); 
                a.disabled = false; 
                aa.style.display = "none"; 
     
            } 
     
            function inputCss(){ 
                var a =  document.getElementById("inputCss"); 
                a.style.border = "0px solid white"; 
                a.value = "css"; 
     
            } 
     
            function inputClose() { 
                var a =  document.getElementById("inputClose/Open"); 
                a.hidden = true; 
            } 
     
            function inputOpen() { 
                var a =  document.getElementById("inputClose/Open"); 
                a.hidden = false; 
            } 
     
            function inputChangeColor(){ 
                var a = document.getElementById("inputChangeColor"); 
                a.style.color= "red"; 
     
     
            } 
     
                            function changePhotoOut(){ 
                var a = document.getElementById("phoTwoFst"); 
                a.style.display = "block"; 
                c.style.display = "none"; 
                     
    }   
     
                    function changePhotoOn(){ 
                var a = document.getElementById("phoTwoFst"); 
                a.style.display = "none"; 
                c.style.display = "block"; 
                     
    }   
     
                    function submitTwo() { 
                var a = document.getElementById("submitTwo"); 
                a.disabled = true; 
                a.value = "nnnn"; 
            } 
     
            function submitOne() { 
                var a = document.getElementById("submitOne"); 
                a.value = "nnnn"; 
            } 
                    function inputChangeOne() { 
                var a = document.getElementById("inputChangeOne"); 
               a.value = "i changed my text"; 
            } 
     
            function inputChangeTwo() { 
                var a = document.getElementById("inputChangeTwo"); 
                number++; 
                if (number == 1){ 
                    a.value = "i changed my text"; 
                }else if(number == 2){ 
                    a.value = "i changed my text again"; 
                }else{ 
                    number = 0; 
                } 
            } 
     
     
            function inputWhileTrue () { 
                var inputWhile = document.getElementById("input_While"); 
                while(true){ 
                    alert(this.value); 
                } 
            } 
            function buttClickInputOne() { 
                var a = document.getElementById("inp"); 
                alert(a.value); 
            } 
         
            function buttClickInputTwo() { 
                var a = document.getElementById("inpa"); 
                a.value = "asdf"; 
            } 
            function changePhotoClick(){ 
                var a = document.getElementById("phoTwo"); 
                a.style.display = "none"; 
                b.style.display = "block"; 
                 
    }   
    var b = document.getElementById("phoThr"); 
     
    b.style.display = "none"; 
     
    var c = document.getElementById("phoThrSec"); 
     
    c.style.display = "none"; 
     
    let number = 0; 
     
    let aa = document.getElementById("submitUnblock"); 
    aa.style.display="none"; 
     
    let aaa = 0;

у меня есть такой код: 
 
    <!DOCTYPE html> 
    <html lang="en"> 
    <head> 
        <meta charset="UTF-8"> 
        <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
        <meta http-equiv="X-UA-Compatible" content="ie=edge"> 
        <title>Document</title> 
    </head> 
    <body> 
        <button onclick="alert('hi')">hi</button><br><br> 
        <button onmousemove="alert('hi')">hi</button><br><br> 
        <button ondblclick="alert('hi')">hi</button><br><br> 
        <div style="border: 1px solid red" onmouseout="alert('hi')">наведи на меня а потом убери</div><br><br> 
     
            <input type="text" value="ку-ку" id="inp"> 
            <button onclick="buttClickInputOne();">hi</button><br><br> 
            <input type="text" value="ку-ку" id="inpa"> 
            <button onclick="buttClickInputTwo();">hi</button><br><br> 
     
    <div> 
     
    <img src="../photo2.jpg" alt="" id="phoTwo" width="200px" height="200px"> 
    <img src="../photo3.jpg" alt="" id="phoThr" width="200px" height="200px"> 
    <button onclick="changePhotoClick()">click</button> 
    </div> 
     
    <input type="text" id="input_While" onclick="inputWhileTrue()" value="click on me"><br><br> 
     
    <input type="text" id="inputChangeOne" onclick="inputChangeOne()" value="click on me"><br><br> 
     
    <input type="text" id="inputChangeTwo" onclick="inputChangeTwo()" value="click on me"><br><br> 
     
    <input type="submit" value="hhhhhhhhhhhhhhhhhh" id="submitOne" onclick="submitOne()"><br><br> 
     
    <input type="submit" value="hhhhhhhhhhhhhhhhhh" id="submitTwo" onclick="submitTwo()"> 
     
     
    <div> 
     
            <img src="../photo2.jpg" alt="" id="phoTwoFst" width="200px" height="200px" onmousemove="changePhotoOn()"> 
            <img src="../photo3.jpg" alt="" id="phoThrSec" width="200px" height="200px" onmouseout="changePhotoOut()"> 
            </div> 
     
            <input type="text" id="inputChangeColor"  value="click on me"> 
            <button onclick="inputChangeColor()">click</button><br><br> 
     
            <input type="text" id="inputClose/Open"  value="click on me"> 
            <button onclick="inputClose()">click</button> 
            <button onclick="inputOpen()">click</button><br><br> 
     
            <input type="text" id="inputCss"  value="click on me"> 
            <button onclick="inputCss()">click</button><br><br> 
     
            <input type="submit" id="submitBlock" onclick="submitBlock()" value="click on me"><br><br> 
            <input type="submit" id="submitUnblock" onclick="submitUnblock()" value="click on me"><br><br> 
             
            <input type="submit" id="submitClick" onclick="submitClick()" value="click on me"><br><br> 
     
            <div style="position: relative; width: 100%; height: 100px;"> 
     
            <input type="text" id="inputMove"  value="click on me" style="position: absolute;"> 
            <button onclick="inputMove()" style="position: absolute; left: 200px;" id="submitMove">click</button><br><br> 
                </div> 
            <input type="text" id="inputCsss"  value="click on me" style="position: absolute;"> 
            <button onclick="inputCsss()" style="position: absolute; left: 200px;" id="submitCsss">click</button><br><br> 
     
            <input type="text" id="inputChangeTwoFst"  value="click me" ><br><br> 
            <input type="text" id="inputChangeTwoSec"  value="click on me" > 
            <button onclick="inputChangeTwoOther()" id="inputChangeTwoOther">click</button><br><br> 
     
   
 
 
</body> 
</html>