class Residents:
    __title = ['1', '1', '1', '1', '1', '1']
    __format = '{:>20} {:>10} {:>20} {:>20} {:>15} {:>15}\n'

    def __init__(self):
        self.__data = []
        self.__index = 0

    def __str__(self):
        return '\n'.join(' '.join(line) for line in self.__data)

    def __iadd__(self, other):
        self.__data.append(other)
        return self

    def __iter__(self):
        return self

    def __next__(self):
        if self.__index >= len(self.__data):
            self.__index = 0
            raise StopIteration
        else:
            result = self.__data[self.__index]
            self.__index += 1
            return result

    def print(self, file_name):
        file = open(file_name, 'w')
        file.write(self.__format.format(*self.__title))
        for line in self.__data:
            file.write(self.__format.format(*line))
        file.close()

    def count_floor(self, floor):
        result = 0
        floor = str(floor)
        for line in self.__data:
            if line[1][:-2] == floor:
                result += 1
        return result

    @property
    def len(self):
        return len(self.__data)


residents = Residents()

file = open('input.txt', 'r')
for line in file:
    residents += line.rstrip().split(';')
file.close()

print('__str__:\n', residents, '\n', sep='')

print('__next__ & __iter__:')
for elem in residents:
    print(elem)
print()

residents.print('output.txt')

print(':', residents.count_floor(2))

print(':', residents.len)