import java.util.Scanner;

public class Main {

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.nextLine());
		String a= sc.nextLine();
		String[] al = {"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z",
				"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"} ;
        String[] array = a.split("");
        n = n%26;

        for (int i = 0; i < array.length; i++) {
            for (int j = 0; j < 26; j++) {
            	if(array[i].equals(al[j])){
            		array[i] = al[j+n];
            		break;
            	}
            }
        }

        for (int i = 0; i < array.length; i++) {
        	System.out.print(array[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