document.getElementById("prompt").onclick = function () {

                var flag = document.getElementById("flag").value;

                var rotFlag = flag.replace(/[a-zA-Z]/g, function(c){return String.fromCharCode((c <= "Z" ? 90 : 122) >= (c = c.charCodeAt(0) + 13) ? c : c - 26);});

                if ("PyvragFvqrYbtvafNerRnfl@syner-ba.pbz" == rotFlag) {

                    alert("Correct flag!");

                } else {

                    alert("Incorrect flag, rot again");

                }

            }
        

rotflag = 'PyvragFvqrYbtvafNerRnfl@syner-ba.pbz'

flag=''

n=0

s=0

for i in rotflag:

    if (i<='Z' and i>='A') or (i<='z' and i>='a'):

        i=(ord(i)+13) if ((90 if(i <= 'Z')  else 122) >= (ord(rotflag[n]) + 13) ) else (ord(i) - 13)

        flag+=chr(i)

    else:

        flag+=i

    n+=1

print(flag)