import strutils, sequtils, math

proc judge(a, b: openArray[int]; depth: int): string =
  if depth == 3:
    return "YES"
  if a[depth] > b[depth]:
    return "YES"
  elif a[depth] < b[depth]:
    return "NO"
  else:
    return judge(a, b, depth + 1)

var
  a_seq = split(readLine(stdin), '.').mapIt(int, it.parseInt)
  b_seq = split(readLine(stdin), '.').mapIt(int, it.parseInt)

echo(judge(a_seq, b_seq, 0))