A0,B0,C0 = map(int,input().split('.'))
A1,B1,C1 = map(int,input().split('.'))

if A1-A0 < 0 :
	print("YES")
elif A1-A0 > 0 :
	print("NO")
elif B1-B0 < 0 :
	print("YES")
elif B1-B0 > 0 :
	print("NO")
elif C1-C0 <= 0 :
	print("YES")
else :
	print("NO")