import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String a = "ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ";
		Scanner kb = new Scanner(System.in);
		int n = kb.nextInt();
		String s = kb.next();
		String p = "";
		for (int i = 0; i < s.length(); i++) {
			char b = s.charAt(i);
			int c = a.indexOf(b);
			p += a.charAt(c + n);
		}
		System.out.println(p);
		kb.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