#!/usr/bin/python
# -*- coding: utf-8 -*-

kaseki = map(int, raw_input().split("."))
obj = map(int, raw_input().split("."))

for i in xrange(3):
       	if obj[i] < kaseki[i]:
       		print "YES"
       		exit()
       	elif obj[i] > kaseki[i]:
       		print "NO"
       		exit()

       	if i == 2 and obj[i] == kaseki[i]:
       		print "YES"
       		exit()
else:
       	print "NO"