#!/usr/bin/env python3
#fileencoding: utf-8

kaseki = [int(i) for i in input().strip().split(".")]
target = [int(i) for i in input().strip().split(".")]

is_kaseki = True

for i in range(len(kaseki)):
    if target[i] > kaseki[i]:
        is_kaseki = False
        break
if is_kaseki:
    print("YES")
else:
    print("NO")