using System;

public class Program

{

    public static void Main()

    {

      string accounts = "25542A,21516B,31154C,45645D,13215E,15655F,45645G";

      Console.WriteLine(ContainAccount(accounts, "15655F"));

    }

    //Returns if account is part of the comma separated accounts list.

    public static bool ContainAccount(string accounts_, string account_)

    {

        throw new NotImplementedException();

    }

}