
import java.io.*;
import java.util.*;
public class Main {
	public static void main(String[] args) throws Exception{
		// TODO Auto-generated method stub
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String s=br.readLine();
		int k=Integer.valueOf(s);
		s=br.readLine();
		int n=s.length();
		if(n<=k)
			System.out.println(s);
		else
		{
			String t=s.substring(0,k);
			t=t+"...";
			System.out.println(t);
		}
	}

}

/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