using System;

using System.Threading.Tasks;

using Nelibur.Core.Extensions;

​

// ---------------------------------------------------------

// -----------         POWERED BY NELIBUR        -----------

// ---------------------------------------------------------

​

​

public class Program

{

    public static void Main()

    {

        const string Input = "a=1,b=2,c=f1,d=f2";

        Console.WriteLine(Input);

        var data = Input.Split(',');

        data.IterI((i, x) =>

        {

            if (i % 2 == 0)

            {

                Swap(ref data[i], ref data[i + 1]);

            }

        });

        var result = string.Join(",", data);

        Console.WriteLine(result);

    }

​

    private static void Swap(ref string left, ref string right)

    {

        var leftData = left.Split('=');

        var rightData = right.Split('=');

        var temp = leftData[1];

        leftData[1] = rightData[1];

        rightData[1] = temp;

        left = string.Join("=", leftData);

        right = string.Join("=", rightData);

    }

}