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<!DOCTYPE Html />
<html>
<head>
<title>FLARE On 2017</title>
</head>
<body>
<input type="text" name="flag" id="flag" value="Enter the flag" />
<input type="button" id="prompt" value="Click to check the flag" />
<script type="text/javascript">
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");
}
}
</script>
</body>
</html>