package main

import "fmt"

func readVersion() []int {
	var x, y, z int
	fmt.Scanf("%d.%d.%d", &x, &y, &z)
	return []int{x, y, z}
}

func main() {
	v0, v1 := readVersion(), readVersion()
	for i := 0; i < 3; i++ {
		if v0[i] < v1[i] {
			fmt.Println("NO")
			return
		}
		if v0[i] > v1[1] {
			fmt.Println("YES")
			return
		}
	}
	fmt.Println("YES")
}