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

public class Main {

    public static void main(String[] args) throws Exception {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int shift = Integer.parseInt(in.readLine());
        String string = in.readLine();
        for (int i = 0; i < string.length(); i++) {
            int val = string.charAt(i)-'A';
            val += shift;
            val %= 26;

            System.out.print(((char)(val + 'A')));
        }
        System.out.print('\n');
    }

}
/*


 */
/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