package main

import (
	"fmt"
	"strings"
)

func main() {
	var s0, s1 string
	fmt.Scan(&s0, &s1)
	ss0 := strings.Split(s0, ".")
	ss1 := strings.Split(s1, ".")
	ans := "NO"
	if ss1[0] <= ss0[0] {
		if ss1[1] <= ss0[1] {
			if ss1[2] <= ss0[2] {
				ans = "YES"
			}
		}
	}
	fmt.Println(ans)
}