import java.util.*;
import java.math.*;
 
public class Main { //クラス名はMain
    public static void main(String[] args) {
      //整数の入力
      Scanner sc = new Scanner(System.in);
      Integer K = Integer.parseInt(sc.next());
      String S = sc.next();

      String answer = K >= S.length() ? S : S.substring(0,K) + "...";

      System.out.println(answer);
    }
}

/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