using System;

public class Program

{

    public static string ReFormatAdressString(string str)

    {

        str = str.Replace(",74,","").Replace("643,","").Replace(",", " ").Trim();

        var reg = new System.Text.RegularExpressions.Regex(@"\s{2,}");

        return reg.Replace(str, " ");

    }

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}