a1, b1, c1 = map(int, input().split('.'))
a2, b2, c2 = map(int, input().split('.'))

l1 = 1000000*a1 + 1000*b1 + c1
l2 = 1000000*a2 + 1000*b2 + c2

print(['YES', 'NO'][l1 < l2])