<?php $base = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9,]; $count = trim(fgets(STDIN)); for($i = 0; $i < $count ; $i++) { $nums = explode(' ', trim(fgets(STDIN))); $y_or_n = array_pop($nums); if($y_or_n == 'YES') { $base = array_intersect($base, $nums); } else if ($y_or_n == 'NO') { $base = array_diff($base, $nums); } } foreach($base as $val) { echo $val.PHP_EOL; }