<?php
while ($tmp = fgets(STDIN)) {
	$s[] = trim($tmp);
}
foreach ($s as $key => $value) {
	$array[] = explode(" ", $value);
}
$line = array_splice($array, 0, 1);

for ($i=0; $i<$line[0][0]; $i++) {
    if ($array[0][$i] !== $array[1][$i]) {
        echo $array[0][$i].PHP_EOL;
        echo $array[1][$i].PHP_EOL;
        break;
    }
}
?>