<?php
$stdin = file("php://stdin");
$content = "";
for ($i = 2; $i < count($stdin); $i += 3) { $content .= $stdin[$i];
}
echo $content;
PD9waHAKCiRzdGRpbiA9IGZpbGUoInBocDovL3N0ZGluIik7CgokY29udGVudCA9ICIiOwoKZm9yICgkaSA9IDI7ICRpIDwgY291bnQoJHN0ZGluKTsgJGkgKz0gMykgewoJJGNvbnRlbnQgLj0gJHN0ZGluWyRpXTsKfQoKZWNobyAkY29udGVudDs=