M = list(map(int, input().split(".")))
N = list(map(int, input().split(".")))
if M[0] > N[0]:
    print("YES")
elif M[0] == N[0] and M[1] > N[1]:
    print("YES")
elif M[0] == N[0] and M[1] == N[1] and M[2] >= N[2]:
    print("YES")
else:
    print("NO")