import java.io.*;

public class Main {
    public static void main(String [] args) {
        try {
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            int k = Integer.parseInt(in.readLine());
            String s = in.readLine();
            if (s.length() <= k) {
                System.out.print(s);
            } else {
                System.out.print(s.substring(0, k) + "...");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
/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