Problem:
Score : 200 points

Problem Statement

We have a string S consisting of uppercase English letters. Additionally, an integer N will be given.

Shift each character of S by N in alphabetical order (see below), and print the resulting string.

We assume that A follows Z. For example, shifting A by 2 results in C (A \to B \to C), and shifting Y by 3 results in B (Y \to Z \to A \to B).

Constraints

0 \leq N \leq 26

1 \leq |S| \leq 10^4

S consists of uppercase English letters.

Input

Input is given from Standard Input in the following format:

N
S

Output

Print the string resulting from shifting each character of S by N in alphabetical order.

Sample Input 1

2
ABCXYZ

Sample Output 1

CDEZAB

Note that A follows Z.

Sample Input 2

0
ABCXYZ

Sample Output 2

ABCXYZ

Sample Input 3

13
ABCDEFGHIJKLMNOPQRSTUVWXYZ

Sample Output 3

NOPQRSTUVWXYZABCDEFGHIJKLM

Solution in Go (1.6) (judge verdict: Accepted)

package main

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

var sc = bufio.NewScanner(os.Stdin)

func main() {
	num := scanIntNum()
	input := scanString()
	fmt.Println(rot(num, input))
}

func rot(n int, s string) string {
	var result []byte
	for i := 0; i < len(s); i++ {
		c := s[i]
		if int(c) > 90-n {
			c = c - byte(26)
		}
		c = c + byte(n)
		result = append(result, c)
	}
	return string(result)
}

func scanIntNum() (num int) {
	sc.Scan()

	num, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return num
}

func scanString() string {
	sc.Scan()

	return sc.Text()
}