fun readInt () =
    valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn)

fun readChar () =
    valOf (TextIO.scanStream Char.scan TextIO.stdIn)


val () =
    let
        val a0 = readInt ()
        val _ = readChar ()
        val b0 = readInt ()
        val _ = readChar ()
        val c0 = readInt ()

        val a1 = readInt ()
        val _ = readChar ()
        val b1 = readInt ()
        val _ = readChar ()
        val c1 = readInt ()

        val ans = case (Int.compare (a0, a1), Int.compare (b0, b1), Int.compare (c0, c1)) of
                      (LESS, _, _) => "NO"
                    | (EQUAL, LESS, _) => "NO"
                    | (EQUAL, EQUAL, LESS) => "NO"
                    | (_, _, _) => "YES"
    in
        print (ans ^ "\n")
    end