S = list(map(int, input().split(".")))
T = list(map(int, input().split(".")))

if S[0] > T[0]:
    print("YES")
    exit()

if S[0] < T[0]:
    print("NO")
    exit()

if S[1] > T[1]:
    print("YES")
    exit()

if S[1] < T[1]:
    print("NO")
    exit()

if S[2] >= T[2]:
    print("YES")
    exit()

print("NO")