import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
	      Scanner scan = new Scanner(System.in);
	      int k = scan.nextInt();
	      String s = scan.next();
	      if(s.length()<=k) {
	    	  System.out.println(s);
	      }else {
	    	  String a = s.substring(0,k);
	    	  System.out.println(a+"...");
	      }
	}
}

/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