import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num = scan.nextInt();
        String str = scan.next();
        String alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        String result = "";

        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            int wantGet = (alpha.indexOf(c) + num) % 26;
            String[] alphaList = alpha.split("");
            result += alphaList[wantGet];
        }

        System.out.println(result);
    }
}
/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