using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Enumerable.Range(0,4).Zip(

            Enumerable.Range(0,4).Reverse(),

            (x,y) => new {x = x,y = y})

            .ToList().ForEach(x => Console.WriteLine(x.x + " : " + x.y));

    }

}