import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int num = sc.nextInt();
		
		String input = sc.next();
		
		for(int i = 0; i < input.length(); i++) {
			int tmp = (input.charAt(i) + num);
			
			if(tmp > 'Z')
				tmp = tmp - 'Z' + 'A' -1;
			System.out.print((char)(tmp));
		}
	}
}
/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