a0, b0, c0 = map(int,input().split("."))
a1, b1, c1 = map(int,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")
		elif c0 < c1:
			print("NO")
		else:
			print("YES")