import java.util.*;
import java.io.*;
 
public class Main {
    public static void main (final String[] args) {
        final Scanner sc = new Scanner(System.in);
      	int n = Integer.parseInt(sc.next());
        String str = sc.next();
        
        if (n < str.length()) {
          	System.out.print(str.substring(0,n));
          	System.out.println("...");
        } else {
          	System.out.println(str);
        }
        
    }
}
/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