class IteratorWithoutZeros:
    def __init__(self, my_list, BEZ_ZER):
        self.list = my_list
        self.max = len(self.list)
        self.actual_position = 0
        self.BEZ_ZER = BEZ_ZER

    def __next__(self):
        if(self.BEZ_ZER):
            self.actual_position = self.actual_position + 1
            while self.list[self.actual_position] == 0:
                self.actual_position = self.actual_position + 1
                if self.actual_position == self.max:
                    raise StopIteration
            return self.list[self.actual_position]
        else:
            self.actual_position = self.actual_position + 1
            if self.actual_position == self.max:
                raise StopIteration
            return self.list[self.actual_position]

    def __iter__(self):
        return self