import java.util.Scanner;
public class Main{
  public static void main(String args[]){
      Scanner l = new Scanner(System.in);
      int length = l.nextInt();
      String word = l.next();
      
      if(word.length() > length){
          String newS = word.substring(0, length);
          System.out.println(newS+"...");
        }
        else{
            System.out.println(word);
        }
}
}

/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