import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		
		  Scanner sc = new Scanner(System.in);
		  
	        int n = sc.nextInt();
	        String s = sc.next();
	        sc.close();
	        int[] a = new int[s.length()];
	        for(int i = 0 ; i < s.length() ; i++ ){
	            a[i] = (s.charAt(i) - 65 + n) % 26 + 65;
	            System.out.print((char)a[i]);
	        }
	        System.out.println();
	}

}

/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