using System;

using System.Text.RegularExpressions;

public class Program

{

    public static string Quoterize(string s)

    {

        return Regex.Replace(s, @"\w+", match => "\"" + match + "\"");

    }

    public static string MoveToRegexPlease(string s)

    {

            return s

                .Replace("\n", ","+Environment.NewLine)

                .Replace(" ", "")

                .Replace(Environment.NewLine, "")

                .Replace("{,", "{")

                .Replace(",}", "}");

    }

    public static void Main()

    {

        var k = @"parent_item {

key: value

key: value

child_item {

    key: value

    key: value

}

child_item {

    key: value

    key: value

    key: value

    grandchild_item {

        key: value

        key: value

    }

}

key: value

key: value

}

parent_item {

    key: value

    key: value

    child_item {

        key: value

        key: value

    }

}";

        Console.WriteLine("{"+MoveToRegexPlease(Quoterize((k).Replace("{", ": {")))+"}");

    }

}