package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	var sver, dver int
	sc := bufio.NewScanner(os.Stdin)
	sc.Scan()
	svers := strings.Split(sc.Text(), ".")
	sc.Scan()
	dvers := strings.Split(sc.Text(), ".")
	for i := 0; i < 3; i++ {
		sver, _ = strconv.Atoi(svers[i])
		dver, _ = strconv.Atoi(dvers[i])
		if dver < sver {
			fmt.Println("YES")
			os.Exit(0)
		} else if dver > sver {
			fmt.Println("NO")
			os.Exit(0)
		}
	}
	fmt.Println("YES")
}