package main

import (
	"fmt"
	"sort"
)

type RuneSlice []rune

func (p RuneSlice) Less(i, j int) bool {
	return p[i] < p[j]
}

func (p RuneSlice) Len() int {
	return len(p)
}

func (p RuneSlice) Swap(i, j int) {
	p[i], p[j] = p[j], p[i]
}

func resolve(A, B RuneSlice) string {
	sort.Sort(A)
	sort.Sort(B)
	if string(A) == string(B) {
		return "YES"
	}
	return "NO"
}

func main() {
	var A, B string
	fmt.Scanf("%s\n%s\n", &A, &B)
	fmt.Println(resolve(RuneSlice(A), RuneSlice(B)))
}