s = input().split(".")
p = input().split(".")

S = [int(i) for i in s]
P = [int(j) for j in p]

if S == P:
    print("YES")

else:
    for i in range(3):
        if S[i] > P[i]:
            print("YES")
            break
        elif S[i] < P[i]:
            print("NO")
        else:
            continue