import java.util.*;

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