import java.util.*;

public class Main{
	public static void main(String args[]){
      Scanner sc = new Scanner(System.in);
      int num = sc.nextInt();
      String str = sc.next();
      if(str.length() > num){
        str = str.substring(0, num) + "...";
      }
      System.out.println(str);
    }
}
/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