class Problem0138:
	def solve(this):
		a1,b1,c1 = map(int, input().split("."))
		a2,b2,c2 = map(int, input().split("."))
		
		if a1 < a2:
			print("NO")
		elif a1 == a2 and b1 < b2:
			print("NO")
		elif a1 == b1 and a2 == b2 and c1 < c2:
			print("NO")
		else:
			print("YES")
			
if __name__ == "__main__":
	problem = Problem0138()
	problem.solve()