using System;

public class Program

{

    public static void Main()

    {

        Foo("a", x => Console.WriteLine(x));

        Foo("b", Print);

    }

    private static void Foo(string text, Action<string> action)

    {

        action.Invoke(text);

    }

    private static void Print(string text)

    {

        Console.WriteLine(text);

    }

}