using System;

using System.Threading.Tasks;

public class Program

{

    public static async Task Main()

    {

        var a = System.Text.Json.JsonSerializer.Deserialize<object>("{\"a\":\"a\"}");

        var b = Newtonsoft.Json.JsonConvert.DeserializeObject<object>("{\"a\":\"a\"}");

        Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(a));

        Console.WriteLine(System.Text.Json.JsonSerializer.Serialize(b));

    }

}