using System;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var a = new List<int> {1, 3, 10, 10, 9, 1, 19};

        RemoveOdd(a);

        Console.WriteLine(string.Join(",", a));

    }

    public static void RemoveOdd(IList<int> x) {

        // your code goes here

    }

}