import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner kb = new Scanner(System.in);
		int k = kb.nextInt();
		String s = kb.next();
		String q = "";
		for (int i = 0; i < s.length(); i++) {
			if (i < k) {
				q += s.charAt(i);
			} else {
				q += "...";
				break;
			}
		}
		System.out.println(q);
		kb.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