package main

import . "fmt"
import . "slices"

func main() {
	var s,t string
	Scan(&s,&t)
	a:=[]byte(s)
	b:=[]byte(t)
	Sort(a)
	Sort(b)
	s=string(a)
	t=string(b)
	if s==t {
		Println("YES")
	} else {
		Println("NO")
	}
}