using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        var input = @"{

""FirstName"" :""Kaustubh"",

""LastName"" :"" Sawant "",

""StartTime"" :""01:00:00""

}";

        var result = Regex.Replace(input, @"[,{}\"")]", "").Trim();

        Console.WriteLine(result);

    }

}