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) {
        System.out.println(f());
        System.out.println(f("aaa"));
        System.out.println(f("aaa", "bbb", "ccc"));
    }
    
    private static List<String> f(String... values) {
        System.out.println(values.length);
        return Arrays.asList(values);
    }
}