object Main {
  // a >= b なら true
  def comp(a: Array[Int], b: Array[Int]): Boolean = {
    // println(a.mkString(" "))
    // println(b.mkString(" "))

    if (a(0) != b(0)) return a(0) > b(0)
    if (a(1) != b(1)) return a(1) > b(1)
    if (a(2) != b(2)) return a(2) > b(2)
    return true
  }

  def main(args: Array[String]) {
    val sc = new java.util.Scanner(System.in);

    val s = sc.nextLine.split('.').map(_.toInt).toArray
    val t = sc.nextLine.split('.').map(_.toInt).toArray
    if (comp(s, t))
      println("YES")
    else
      println("NO")
  }
}