A0,B0,C0 = map(int,input().split('.'))
A1,B1,C1 = map(int,input().split('.'))
S = A0 * 1000000 + B0 * 1000 + C0
T = A1 * 1000000 + B1 * 1000 + C1
if S >= T:
    print('YES')
else:
    print('NO')