import java.util.Scanner;

public class Main { 
    
    public static void main(String[] args) {
      Scanner s = new Scanner(System.in);
      s.useDelimiter("\n");
      int key = s.nextInt();
      char[] planeChars = s.next().toCharArray();
     
      String cipher = cipherBuilder(planeChars, key);
      System.out.println(cipher);
    }
  
  public static String cipherBuilder(char[] planeChars, int key) {
    
    String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    int placeCharLen = planeChars.length;
    
    StringBuilder cipherSB = new StringBuilder();
      for (int i = 0; i < placeCharLen; i++) {
      	int index = alphabet.indexOf(planeChars[i]);
        
        if (index + key > 25) {
          	index = index + key - 26;
        } else {
        	index = index + key;
        }
        
        cipherSB.append(alphabet.charAt(index));
      }
      return cipherSB.toString();
  }
}
/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