import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)) {


			int n = sc.nextInt();
			String s = sc.next();
			
			char[] chars = s.toCharArray();
			
			char[] converted = new char[chars.length];
			
			for(int i = 0 ; i < chars.length ; i++ ) {
				converted[i] = (char)(chars[i] + n);
				if (converted[i] > 'Z' ) {
					converted[i] = (char)(converted[i] - 26);
				}
			}
			
			System.out.println(String.copyValueOf(converted));
		}
	}
}
/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