/******************************************************************************

                            Online Java Compiler.
                Code, Compile, Run and Debug java program online.
Write your code in this editor and press "Run" button to execute it.

*******************************************************************************/
import java.util.*;
import java.io.*;
public class Main
{
	public static void main(String[] args) throws Exception{
		BufferedReader br = new BufferedReader(new InputStreamReader (System.in));
		String s = br.readLine();
		int k = Integer.parseInt(s);
		
		s = br.readLine();
		int n = s.length();
		if(n <= k)
		    System.out.println(s);
		else
		{
		    for(int i=0; i<k; i++)
		        System.out.print(s.charAt(i));
		    System.out.println("...");
		}
	}
}

/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