import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		String S = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		String s = sc.next();

		for(int i = 0; i < s.length(); i++) {
			int a = S.indexOf(s.charAt(i)) + n;
			if(a >= 26) a -= 26;
			System.out.print(S.charAt(a));
		}
	}
}
/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