package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func main() {
	var sc = bufio.NewScanner(os.Stdin)
	sc.Buffer(make([]byte, 0, 200000+2), 200000+2)
	sc.Scan()
	N, _ := strconv.Atoi(sc.Text())
	sc.Scan()
	S := sc.Text()

	t := make([]byte, N)
	for i := 0; i < N; i++ {
		c := S[i] - 'a'
		t[i] = 'z' - c
	}
	fmt.Println(string(t))
}