public new static PassportV2 Parse(string passportInfo) => new PassportV2(Passport.Parse(passportInfo).Info);
/// <summary>
/// Count invalid passports within a text input.
/// </summary>
/// <param name="passports">Double newline separated passports.</param>
/// <returns>Count of valid passports.</returns>
public static int Solve(string passports)
{
var passportsArray = passports.Split(Environment.NewLine + Environment.NewLine);
return(passportsArray.Count(p => Passport.Parse(p).IsValid()));
}