// package app;

import java.math.BigDecimal;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Scanner;
import java.util.stream.Stream;

public class Main {

    public static void main(final String[] args) throws Exception {

        Scanner sc = new Scanner(System.in);

        long N = sc.nextLong();
        String text = sc.next();

        StringBuffer sb = new StringBuffer(text);

        for (int i = 0; i < text.length(); i++) {
            char ch = text.charAt(i);
            sb.setCharAt(i, ch + N > 'Z' ? (char) (ch + N - ('Z' - 'A') - 1) : (char) (ch + N));
        }

        System.out.println(sb.toString());
    }
}
/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