package main

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

func SortString(w string) string {
    s := strings.Split(w, "")
    sort.Strings(s)
    return strings.Join(s, "")
}

func main() {
  var A, B string
  fmt.Scan(&A, &B)
  
  if SortString(A) == SortString(B) {
    fmt.Println("YES")
  } else {
    fmt.Println("NO")
  }
}