using System;

​

public class PrintSequence

{

    public static void Main()

    {

        int count = 10;

        for (int i = 2; i <= count + 1; i++)

        {

            if (i % 2 == 0)

            {

                Console.Write(i);

            }

            else

            {

                Console.Write(-i);

            }

​

            if (i != count + 1)

            {

                Console.Write(",");

            }

        }

    }

}