import java.io.UnsupportedEncodingException;
import java.util.*;

public class Main{
    public static void main(String[] args) throws UnsupportedEncodingException{
        Scanner scan = new java.util.Scanner(System.in);
        byte n = scan.nextByte();
        String s = scan.next();
        byte[] a = new byte[s.length()];
        for(int i = 0; i < s.length(); i++){
            a[i] = (byte) (s.codePointAt(i) - 65);
            a[i] = (byte) ((a[i] + n) % 26 + 65);
        }
        System.out.println(new String(a, "UTF-8"));
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz