using System;

public class Program

{

    private static string testInput = "shape_01, shape_02,shape_03";

    public static void Main()

    {

        string[] inputs = testInput.Replace(" ", "").Split(',');

        int count = inputs.Length;

        for (int level = -1; level < 4; level++)

        {       

            int index = Clamp(0, count - 1, level);

            string output = inputs[index];

            Console.WriteLine("Level : " + level + ", Output : " + output);

        }

    }

    private static int Clamp(int min, int max, int value)

    {

        return Math.Max(0, Math.Min(max, value));

    }

}