using System;

public class Program

{

    public static void Main()

    {

        printArray(0, new string[]{"1", "a", "2", "b"});

    }

    public static void printArray(int index, string[] s){

        //Base Case:

        if(index > s.Length - 1)

            return;

        Console.WriteLine(s[index]);

        printArray(index + 1, s);

    }

}