import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int num = sc.nextInt();
		String str = sc.next();
		char ch1[] = str.toCharArray();

		for (int i = 0; i < ch1.length; i++) {
			if ((ch1[i] + num) > 90)
				ch1[i] = (char) ((ch1[i] + num) % 90 + 64);
			else
				ch1[i] = (char) ((ch1[i] + num));
			System.out.print(ch1[i]);
		}
	}
}
/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