# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	A0, B0, C0 = list(map(int, list(input().split("."))))
	A1, B1, C1 = list(map(int, list(input().split("."))))
	if A0 > A1:
		print("YES")
	elif A0 < A1:
		print("NO")
	else:
		if B0 > B1:
			print("YES")
		elif B0 < B1:
			print("NO")
		else:
			if C0 >= C1:
				print("YES")
			else:
				print("NO")



if __name__ == '__main__':
	main()