# -*- coding:utf-8 -*-
import sys
if __name__ == "__main__":
	a0,b0,c0 = map(int,raw_input().split("."))
	a1,b1,c1 = map(int,raw_input().split("."))
	if a0 > a1:
		print "YES"
	elif a1 > a0:
		print "NO"
	else:
		if b0 > b1:
			print "YES"
		elif b1 > b0:
			print "NO"
		else:
			if c0 >= c1:
				print "YES"
			else:
				print "NO"