<?php
$version = explode(".", trim(fgets(STDIN)));
$version2 = explode(".", trim(fgets(STDIN)));
$ans = "YES";
for($i = 0; $i < 3; $i++) {
  $s = $version[$i];
  $t = $version2[$i];
  if($s > $t) {
    break;
  } else if($s < $t) {
    $ans = "NO";
    break;
  }
}
print($ans);
?>