package main

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

func main() {
	var s0, s1 string
	fmt.Scan(&s0, &s1)
	ss0 := strings.Split(s0, ".")
	ss1 := strings.Split(s1, ".")
	ans := "YES"
	for i := 0; i < 3; i++ {
		v0, _ := strconv.Atoi(ss0[i])
		v1, _ := strconv.Atoi(ss1[i])
		if v0 < v1 {
			ans = "NO"
			break
		}
	}
	fmt.Println(ans)
}