import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        char[] S = sc.next().toCharArray();
        int length = S.length;
    
    
        for (int i = 0; i < length; i++) {
            int n = (S[i] - 'A' + N) % 26;
            S[i] = (char) (n + 'A');
        }
    
        System.out.println((new String(S)));
    }
}
/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