integer_cls

class Integer:
    def __init__(self, value):
        self.value = value

    @classmethod
    def from_float(cls, float_value):
        try:
            return cls(int(float_value))
        except ValueError:
            return "value is not a float"

    @classmethod
    def from_roman(cls, value):
        return cls(cls.roman_numeral_to_decimal(value))

    @classmethod
    def from_string(cls, value):
        if not isinstance(value, str):
            return 'wrong type'
        try:
            return cls(int(value))
        except ValueError:
            return 'wrong type'

    @staticmethod
    def roman_numeral_to_decimal(roman_numeral):
        tallies = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}

        number = 0
        for i in range(len(roman_numeral) - 1):
            left = roman_numeral[i]
            right = roman_numeral[i + 1]
            if tallies[left] < tallies[right]:
                number -= tallies[left]
            else:
                number += tallies[left]
        number += tallies[roman_numeral[-1]]
        return number