public char[] GetSignsOfType(SignTypes signTypes)
        {
            switch (signTypes)
            {
            case SignTypes.SmallLetters:
                return(Signs.SmallLetters());

            case SignTypes.CapitalLetters:
                return(Signs.CapitalLetters());

            case SignTypes.SmallPolishLetters:
                return(Signs.SmallPolishLetters());

            case SignTypes.CapitalPolishLetters:
                return(Signs.CapitalPolishLetters());

            case SignTypes.SpecialSigns:
                return(Signs.SpecialSigns());

            case SignTypes.Digits:
                return(Signs.Digits());

            default:
                return(null);
            }
        }