package main

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

func main() {
	sc := NewScanner(os.Stdin)
	var line string
	line, _ = sc.NextLine()
	threshold := splitVersion(line)
	line, _ = sc.NextLine()
	target := splitVersion(line)
	for i := 0; i < len(target); i++ {
		switch {
		case target[i] > threshold[i]:
			fmt.Println("NO")
			return
		case target[i] < threshold[i]:
			fmt.Println("YES")
			return
		}
	}
	fmt.Println("YES")
}

func splitVersion(version string) []int {
	tokens := strings.Split(version, ".")
	len := len(tokens)
	splits := make([]int, len)
	for i := 0; i < len; i++ {
		var err error
		splits[i], err = strconv.Atoi(tokens[i])
		if err != nil {
			panic(err)
		}
	}
	return splits
}

type Scanner struct {
	*bufio.Scanner
}

func NewScanner(r io.Reader) *Scanner {
	return &Scanner{
		bufio.NewScanner(r),
	}
}

func (s *Scanner) NextLine() (string, error) {
	s.Scanner.Split(bufio.ScanLines)
	return s.nextToken()
}

func (s *Scanner) nextToken() (string, error) {
	sc := s.Scanner
	if sc.Scan() {
		return sc.Text(), nil
	}
	if sc.Err() != nil {
		return "", sc.Err()
	}
	return "", io.EOF
}