import java.util.*;
class Main{
  public static void main(String[] args){
     Scanner scan=new Scanner(System.in);
     int N=scan.nextInt();
     scan.nextLine();
     String S=scan.nextLine();
    for(int i=0;i<S.length();i++){
      System.out.print((char)(((S.charAt(i)-'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