import java.util.*;
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
   
    int n = sc.nextInt();
    String s = sc.next();
    String ss = "";

    char abc[] = {'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'};
    //メモ　Aが０

    for(int i = 0 ; i < s.length() ; ++i){
      for(int j = 0 ; j < abc.length ; ++j){
        if(s.charAt(i) == abc[j]){
          if(j+n>=26){
            ss += abc[j+n-26];
          }else{
            ss += abc[j+n];
            break;
          }
          
        }
      }
    }
   System.out.println(ss);
  }
}
/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