import java.util.*;
 
public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
        char[] s = sc.next().toCharArray();
		
		
       for(char c : s) {
           // System.out.print((char)((c-'A'+n)%26 + 'A'));
          System.out.print((char)((c-'A'+n)%26 + 'A'));

        }


      
	}
}
/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