import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        f();
        f(new String[0]);
        f(new String[1]);
        f(new String[3]);
        f("111");
        f("111", "222", "333");
    }

    private static void f(String... s) {
        System.out.println(s.length + ": [" + String.join(", ", s) + "]");
    }
}