package main

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

func main() {
	var s0, s1 string
	fmt.Scan(&s0, &s1)
	ss0 := strings.Split(s0, ".")
	ss1 := strings.Split(s1, ".")
	i0 := make([]int, 3)
	i1 := make([]int, 3)
	for i := 0; i < 3; i++ {
		i0[i], _ = strconv.Atoi(ss0[i])
		i1[i], _ = strconv.Atoi(ss1[i])
	}
	var ans string
	if i0[0] > i1[0] {
		ans = "YES"
	} else if i0[0] == i1[0] && i0[1] > i1[1] {
		ans = "YES"
	} else if i0[0] == i1[0] && i0[1] == i1[1] && i0[2] >= i1[2] {
		ans = "YES"
	} else {
		ans = "NO"
	}
	fmt.Println(ans)
}