import java.io.*;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    
    int n = Integer.parseInt(br.readLine());
    char[] s = br.readLine().toCharArray();
    
    for (int i=0; i<s.length; i++) {
      s[i] = (char) ((s[i]-'A'+n)%26+'A');
    }
    System.out.println(new String(s));
  }
}

/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