import java.util.*;
public class Main {
   public static void main(String[] args) {  
      Scanner sc = new Scanner(System.in);
      
      int N = sc.nextInt();
      sc.nextLine();
      String s = sc.nextLine();
      
      String res = "";
      for(char c : s.toCharArray()) {
         res += (char)(((c - 'A') + N) % 26 + 65);
      }
      System.out.println(res);
   }
}
/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