using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        String xyz = "1236,1236;1625,1625;2072,2072;2133,2133;2155,2155;2362,2362;2418,2418;2428,2428;2442,2442;2454,2454;2458,2458;2491,2491;2520,2520;2667,2667;2700,2700;2701,2701;12690,12690;12693,12693;12725,12725;312015,312015;810071,810071;";

        var zzz = xyz.Split(';').Select(i => i.Trim()).ToList();

        foreach (string ids in zzz)

        {

            var id = ids.Split(',').Select(i => i.Trim()).ToList();

            Console.WriteLine(id[0] + " " + id[1]);

        }

    }

}