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

if (A0 < A1 or
    A0 == A1 and B0 < B1 or
    A0 == A1 and B0 == B1 and C0 < C1):
    print("NO")
else:
    print("YES")