using System;

public class Program

{

    public static void Main()

    {

            var s = "E11000 duplicate key error collection: betting.bets.settleds_202012 index: _id_ dup key: { _id: \"o_792986955892654080\" }";

            Console.WriteLine(s.IndexOf("\"", StringComparison.Ordinal));

            Console.WriteLine(s.Substring(s.IndexOf("\"", StringComparison.Ordinal)+1, 20));

    }

}