import java.util.*;
import java.io.*;
public class Main
{
    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        OutputStream outputStream = System.out;
        PrintWriter out = new PrintWriter(outputStream);

        int T;
        T=1;
        while((T--)>0)
        {
            //code comes here
            int K=in.nextInt();
            in.nextLine();
            String str=in.nextLine();
            if(str.length()<=K)
            {
                System.out.println(str);
            }
            else
            {
                System.out.println(str.substring(0, K)+"...");
            }

        }   
        in.close();
    }

}
/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