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: Wrong Answer)

package main

import (
	"fmt"
	"strings"
)

func main() {
	var N int
	var S string

	ans := ""
	fmt.Scanf("%d %s", N, S)
	for index := 0; index < len(S); index++ {
		t := S[index : index+1]
		at := strings.Index("ABCDEFGHIJKLMNOPQRSTUVWXYZ", t)
		targetJ := (at + N) % 26
		target := "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[targetJ : targetJ+1]
		ans += target
	}
	fmt.Println(ans)
}