using System;

public class Program

{

    public static void Main()

    {

        string cleared = "";

        string s = "%5B%7B%22id%22%3A49%2C%22position_name%22%3A%22ventilation_1%22%2C%22position_id%22%3A%2255%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%220%22%7D%2C%7B%22id%22%3A50%2C%22position_name%22%3A%22ventilation_2%22%2C%22position_id%22%3A%2256%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%221000%22%7D%2C%7B%22id%22%3A51%2C%22position_name%22%3A%22ventilation_1%22%2C%22position_id%22%3A%2255%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%222000%22%7D%2C%7B%22id%22%3A52%2C%22position_name%22%3A%22ventilation_3%22%2C%22position_id%22%3A%2257%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%223000%22%7D%2C%7B%22id%22%3A53%2C%22position_name%22%3A%22ventilation_4%22%2C%22position_id%22%3A%2258%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%224000%22%7D%2C%7B%22id%22%3A54%2C%22position_name%22%3A%22ventilation_3%22%2C%22position_id%22%3A%2257%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%225000%22%7D%2C%7B%22id%22%3A55%2C%22position_name%22%3A%22straight%22%2C%22position_id%22%3A%2253%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%226000%22%7D%2C%7B%22id%22%3A56%2C%22position_name%22%3A%22ventilation_5%22%2C%22position_id%22%3A%2259%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%227000%22%7D%2C%7B%22id%22%3A57%2C%22position_name%22%3A%22ventilation_6%22%2C%22position_id%22%3A%2260%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%228000%22%7D%2C%7B%22id%22%3A58%2C%22position_name%22%3A%22ventilation_5%22%2C%22position_id%22%3A%2259%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%229000%22%7D%2C%7B%22id%22%3A63%2C%22position_name%22%3A%22arm_rotation_1%22%2C%22position_id%22%3A%2252%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2210000%22%7D%2C%7B%22id%22%3A64%2C%22position_name%22%3A%22arm_rotation_2%22%2C%22position_id%22%3A%2254%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2211000%22%7D%2C%7B%22id%22%3A65%2C%22position_name%22%3A%22arm_rotation_1%22%2C%22position_id%22%3A%2252%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2212000%22%7D%2C%7B%22id%22%3A66%2C%22position_name%22%3A%22arm_rotation_2%22%2C%22position_id%22%3A%2254%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2213000%22%7D%2C%7B%22id%22%3A67%2C%22position_name%22%3A%22arm_rotation_1%22%2C%22position_id%22%3A%2252%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2214000%22%7D%2C%7B%22id%22%3A73%2C%22position_name%22%3A%22horizontal_arm%22%2C%22position_id%22%3A%2250%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2215000%22%7D%2C%7B%22id%22%3A74%2C%22position_name%22%3A%22wave_improved_1%22%2C%22position_id%22%3A%2246%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2216000%22%7D%2C%7B%22id%22%3A75%2C%22position_name%22%3A%22wave_improved_2%22%2C%22position_id%22%3A%2247%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2217000%22%7D%2C%7B%22id%22%3A76%2C%22position_name%22%3A%22wave_improved_3%22%2C%22position_id%22%3A%2248%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2218000%22%7D%2C%7B%22id%22%3A77%2C%22position_name%22%3A%22wave_improved_4%22%2C%22position_id%22%3A%2249%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2219000%22%7D%2C%7B%22id%22%3A78%2C%22position_name%22%3A%22horizontal_arm%22%2C%22position_id%22%3A%2250%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2220000%22%7D%2C%7B%22id%22%3A79%2C%22position_name%22%3A%22straight%22%2C%22position_id%22%3A%2253%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2221000%22%7D%2C%7B%22id%22%3A80%2C%22position_name%22%3A%22wave_1%22%2C%22position_id%22%3A%2239%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2222000%22%7D%2C%7B%22id%22%3A81%2C%22position_name%22%3A%22wave_2%22%2C%22position_id%22%3A%2240%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2223000%22%7D%2C%7B%22id%22%3A82%2C%22position_name%22%3A%22wave_1%22%2C%22position_id%22%3A%2239%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2224000%22%7D%2C%7B%22id%22%3A83%2C%22position_name%22%3A%22horizontal_arm%22%2C%22position_id%22%3A%2250%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2225000%22%7D%2C%7B%22id%22%3A84%2C%22position_name%22%3A%22straight%22%2C%22position_id%22%3A%2253%22%2C%22duration%22%3A%221000%22%2C%22delay%22%3A%2226000%22%7D%5D";

        string decoded = System.Uri.UnescapeDataString(s);

        Console.WriteLine(decoded);

        decoded = decoded.Remove(0,2);

        decoded = decoded.Remove(decoded.Length - 2,2);

        Console.WriteLine(decoded);

        string[] ldecoded = decoded.Split(new string[] {"},{"}, StringSplitOptions.None);

        Console.WriteLine(ldecoded[0]);

        string[] remove_string = {"\"id\":", "\"position_name\":", "\"position_id\":", "\"duration\":", "\"delay\":"};

        foreach(string entry in ldecoded){

            foreach(string r_string in remove_string){

                int index = entry.IndexOf(r_string);

                cleared = (index < 0) ? entry : entry.Remove(index, r_string.Length);

            }

        }

        Console.WriteLine(cleared);

    }

}