import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {


    public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String line = in.readLine();
        int k = Integer.valueOf(line);
        String s = in.readLine();

        if (s.length() > k) {
            String temp = s.substring(0, k);
            System.out.println(temp + "...");
        }else{
            System.out.println(s);
        }
    }
}

/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