

import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        int n = sc.nextInt();
        String s = sc.next();
        String ans = "";
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            int idx = str.indexOf(c) + n;
            if (str.length() <= idx) {
                idx -= str.length();
            }
            ans += str.charAt(idx);
        }
        System.out.println(ans);

        sc.close();
    }
}
/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