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

$first_letter = $word_arr[$array[0][0]];
$second_letter = $word_arr[$array[0][1]];

$word_arr[$array[0][0]] = $second_letter;
$word_arr[$array[0][1]] = $first_letter;

echo implode("", $word_arr).PHP_EOL;
?>