import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
	    Scanner s = new Scanner(System.in);
	    int k =s.nextInt();
	    s.nextLine();
	    String ss = s.nextLine();
	    if(ss.length()>k) {
            String u = "";
            for (int i = 0; i < k; i++) {
                u += ss.charAt(i);
            }
            u += "...";
            System.out.println(u);
        }
	    else{
            System.out.println(ss);
        }
    }
}

/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