a,b,c = map(int,input().split("."))
d,e,f = map(int,input().split("."))
if a > d:
	print("YES")
elif a == d:
	if b > e:
		print("YES")
	elif b == e:
		if c >= f:
			print("YES")
		else:
			print("NO")
	else:
		print("NO")
else:
	print("NO")