import java.io.*;
import java.util.*;
import java.lang.*;

public class Main
{
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int k = Integer.parseInt(sc.nextLine());
        String s = sc.nextLine();
        if (s.length() <= k) {
            System.out.println(s);
        }
        else {
            System.out.println(s.substring(0, k) + "...");
        }
        
    
    }
}

/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