import java.util.*;
import java.lang.*;
public class Main{
	  public static void main(String args[])
	  {
	    Scanner sc=new Scanner(System.in);
	    int K=sc.nextInt();
        sc.nextLine();
        String S=sc.nextLine();
	    if(S.length()<=K)
	    {
	      System.out.println(" "+S);
	    }
	    else
	    {
	      String str=S.substring(0,K);
	      str=str+"...";
	      System.out.println(" "+str);
	    }
	  }
	}


/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