<?php
$str = "00000000000000000000000000000000000000000000000000000000000000000000000000000000";
$test = trim(fgets(STDIN));
if(strlen($test) == 80)
{
    if($test[0]==1 and $test[1]==1 and $test[2]==1 and $test[3]==1)
    {
    $str=$test;
    }
    else if($test[76]==1 and $test[77]==1 and $test[78]==1 and $test[79]==1)
    {
    $str=strrev($test);
    }
}
echo $str;
?>