import java.util.Scanner;

public class Main {
    public static void main(String args[]) {
        Scanner scan = new Scanner(System.in);
        int charLimit;
        String str, tmp;

        charLimit = scan.nextInt();
        tmp = scan.nextLine();
        str = scan.nextLine();

        if(str.length() <= charLimit) {
            System.out.println(str);
        } else {
            System.out.println(str.substring(0, charLimit) + "...");
        }

        scan.close();
        return;
    }
}
/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