package main

import (
	"fmt"
	"sort"
	"strings"
)

func main() {
	var A, B string
	fmt.Scan(&A, &B)
	sa := strings.Split(A, "")
	sort.Strings(sa)
	sb := strings.Split(B, "")
	sort.Strings(sb)
	for i := range sa{
		if sa[i] != sb[i]{
			fmt.Println("NO")
			break
		}else if i == len(sa)-1{
			fmt.Println("YES")
		}
	}
}