# -*- coding: utf-8 -*-
OLD = map(int, raw_input().split("."))
NEW = map(int, raw_input().split("."))
for i in range(0, 3):
    if OLD[i] < NEW[i]:
        print "NO"
        exit()
    elif OLD[i] > NEW[i]:
        print "YES"
        exit()
    elif OLD[i] == NEW[i]:
        if i == 2:
            print "YES"
            exit()