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 ss0[0] > ss1[0] {
		ans = "YES"
	} else if ss0[0] == ss1[0] && ss0[1] > ss1[1] {
		ans = "YES"
	} else if ss0[0] == ss1[0] && ss0[1] == ss1[1] && ss0[2] >= ss1[2] {
		ans = "YES"
	}
	fmt.Println(ans)
}