package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
)

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Scan()
	A := sc.Bytes()
	sc.Scan()
	B := sc.Bytes()

	sortByteSlice(A)
	sortByteSlice(B)

	for i := 0; i < len(A); i++ {
		if A[i] != B[i] {
			fmt.Println("NO")
			return
		}
	}
	fmt.Println("YES")
}

type byteSlice []byte

func (a byteSlice) Len() int {
	return len(a)
}

func (a byteSlice) Less(i, j int) bool {
	return a[i] < a[j]
}

func (a byteSlice) Swap(i, j int) {
	a[i], a[j] = a[j], a[i]
}

func sortByteSlice(a []byte) {
	sort.Sort(byteSlice(a))
}