import java.io.*;
import java.util.Scanner;
import java.util.Arrays;
import java.util.ArrayList;

public class Main{

    public static void main(String[] args){
        //START

        Scanner sc=new Scanner(System.in);
        int K=sc.nextInt();
        String S=sc.next();

        //System.out.println(S.length());

        if(K>=S.length()){
            System.out.println(S);
        }else{
            String[] strArray=S.split("");

            int i=0;

            for(i=0;i<S.length();i++){
                if(i<K){
                    //System.out.print(i);
                    System.out.print(strArray[i]);
                }else{
                    System.out.print("...");
                    break;
                }
            }
        }

        //END

    }
}


/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