package main

import (
	"fmt"
	"strconv"
	"strings"
)

func main() {
	var s, t string
	fmt.Scan(&s, &t)
	std := strings.Split(s, ".")
	tgt := strings.Split(t, ".")

	ans := "YES"
	for i := 0; i < 3; i++ {
		S, _ := strconv.Atoi(std[i])
		T, _ := strconv.Atoi(tgt[i])
		if T > S {
			ans = "NO"
			break
		} else if T < S {
			ans = "YES"
			break
		} else {
			continue
		}
	}
	fmt.Println(ans)
}