import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		 Scanner sc      = new Scanner(System.in);
		 Integer maxLength =  Integer.parseInt(sc.nextLine());
		 String  stringS =  sc.nextLine();

		 if(stringS.length() > maxLength ) {
			 String output = stringS.substring(0, maxLength);
			 System.out.println(output + "...");
		 }else {
			 System.out.println(stringS);
		 }
	}

}
/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