P = list(map(int, input().split('.')))
L = list(map(int, input().split('.')))

if P[0] > L[0] or (P[0] == L[0] and P[1] > L[1]) or (P[0] == L[0] and P[1] == L[1] and P[2] >= L[2]):
    print('YES')
else:
    print('NO')