import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
	public static void main(String[] args) {
		int num=0;
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		String str = sc.next();
		int k = sc.nextInt()%26;
		StringBuffer sb = new StringBuffer(str);
		for(int i=0;i<n;i++){
			num=0;
			char ch;
			ch = str.charAt(i);
			if((int)ch >= 65 && (int)ch <= 90)
			{
				num = (int)ch + k;
				if(num>90){
					num=64+num-90;
            	}
				
                sb.setCharAt(i, (char)num);
			}
			if((int)ch >= 97 && (int)ch <= 122)
			{
				num = (int)ch + k;
				if(num>122){
					num=96+num-122;
				}
				
				sb.setCharAt(i, (char)num);
			}
		}
		
		System.out.println(sb);
        sc.close();
		
    }
}