<?php
$N = trim(fgets(STDIN));

$list = range(0, 9);

for ($i = 0; $i < $N; $i++) {
	list($a, $b, $c, $d, $result) = explode(" ", trim(fgets(STDIN)));
	$q = [$a, $b, $c, $d];
	if ($result == 'YES') {
		$a = array_diff(range(0, 9), $q);
	} else {
		$a = $q;
	}
	$list = deleteNums($list, $a);
}

$list = array_values($list);

echo $list[0] . "\n";


function deleteNums($list, $del) {
	foreach ($list as $k => $n) {
		if (in_array($n, $del)) {
			unset($list[$k]);
		}
	}
	return $list;
}