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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Text;

class Program
{
    static void Main(string[] args)
    {
        var p = new Program();
        var N = int.Parse(Console.ReadLine());
        var s = Console.ReadLine();
        StringBuilder sb = new StringBuilder();
        //var N = int.Parse(Console.ReadLine());
        //var input = p.ConvertIntArray(p.ReadInput());
        //var A = input[0];
        //var B = input[1];
        //var ans = 0;

        for(var i = 0; i<s.Length; i++)
        {
            char c = Convert.ToChar(s[i]);
            var temp = Convert.ToInt32(c);
            temp = (int)s[i] + N;
            if (temp > 90)
            {
                temp -= 26;
                sb.Append(Convert.ToChar(temp));
            }
            else
            {
                sb.Append(Convert.ToChar(temp));
            }

        }

        Console.WriteLine(sb);

    }


    public string[] ReadInput()
    {
        return Console.ReadLine().Split(' ');
    }

    public int[] ConvertIntArray(string[] x)
    {
        var convertedArray = new int[x.Length];
        for (var i = 0; i < x.Length; i++)
        {
            convertedArray[i] = int.Parse(x[i]);
        }

        return convertedArray;
    }

}