using System;

public class Program

{

    public static void Main()

    {

        var stringValue = test_singleValue(() => {

            return "Hello World";

        });

        Console.WriteLine(stringValue);

        test_arrayValue(() => {

            return new string[] {

                "Hello",

                "World",

                "!"

            };

        });

    }

    public static string test_singleValue(Func<string> lambda) {

        return lambda();    

    }

    public static void test_arrayValue(Func<string[]> lambda) {

        foreach(var value in lambda()) {

            Console.WriteLine(value);

        }

    }

}