Longest Palindrome by clock

<?for(;$s=fgets(STDIN);)for($n=51;$n--;)for($i=0;'
'<$p=substr($s,$i++,$n);)$p==strrev($p)&&$n=$s=!print"$p
";

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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