import java.io.*;
import java.util.*;
public class Main{
public static void main (String[]args) {

    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    try {
    int k = Integer.parseInt(br.readLine());
    String res = br.readLine();
String newRes  = "";
    if(res.length()>k) {
    newRes = res.substring(0, k) + "...";
    }
    else{
        newRes = res;
    }
System.out.println(newRes);

       
    }catch (Exception e) {
       }
       }
   }
/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