package main

import (
	"fmt"
	"reflect"
)

func main() {
	var A, B string
	fmt.Scan(&A, &B)
	Ac := make(map[rune]int)
	Bc := make(map[rune]int)
	for _, c := range A {
		Ac[c]++
	}
	for _, c := range B {
		Bc[c]++
	}
	if reflect.DeepEqual(Ac, Bc) {
		fmt.Println("YES")
		return
	}
	fmt.Println("NO")
}