<?php
$results = [];
while (($line = fgets(STDIN
)) !== false) { $charMap = [];
if (isset($charMap[$char])) { $results[] = $line;
break;
}
$charMap[$char] = 1;
}
}
foreach ($results as $result) {
echo $result . PHP_EOL;
}
PD9waHAKJHJlc3VsdHMgPSBbXTsKCndoaWxlICgoJGxpbmUgPSBmZ2V0cyhTVERJTikpICE9PSBmYWxzZSkgewogICAgJGxpbmUgPSBydHJpbSgkbGluZSk7CiAgICAkY2hhck1hcCA9IFtdOwoKICAgIGZvcmVhY2ggKHN0cl9zcGxpdCgkbGluZSkgYXMgJGNoYXIpIHsKICAgICAgICBpZiAoaXNzZXQoJGNoYXJNYXBbJGNoYXJdKSkgewogICAgICAgICAgICAkcmVzdWx0c1tdID0gJGxpbmU7CiAgICAgICAgICAgIGJyZWFrOwogICAgICAgIH0KICAgICAgICAKICAgICAgICAkY2hhck1hcFskY2hhcl0gPSAxOwogICAgfQp9Cgpmb3JlYWNoICgkcmVzdWx0cyBhcyAkcmVzdWx0KSB7CiAgICBlY2hvICRyZXN1bHQgLiBQSFBfRU9MOwp9