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<?php
const PARENS = ['(', ')'];
const BRACKETS = ['[', ']'];
echo '@x = ';
$x = json_decode(str_replace(PARENS, BRACKETS, fgets(STDIN)));
echo '@y = ';
$y = json_decode(str_replace(PARENS, BRACKETS, fgets(STDIN)));
sort($x);
sort($y);
$expected_difference = $y[0] - $x[0];
$all_expected = array_product(array_map(fn($a, $b) => $b - $a === $expected_difference, $x, $y));
echo $all_expected ? $expected_difference : 'N/A';
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