class Human:
    def __init__(self, name, gender):
        self.name = name
        self.gender = gender

    def create_str_intro(self):
        return f'Hi! I\'m a {self.gender}, my name is {self.name}.'

    def introduce(self):
        print(self.create_str_intro())


class SoftwareDeveloper(Human):
    def __init__(self, name, gender, language):
        super().__init__(name, gender)
        self.language = language

    def create_str_intro(self):
        return super().create_str_intro() + f' I write {self.language}.'

    def introduce(self):
        print(self.create_str_intro())


class DeveloperSchool:
    def __init__(self, language):
        self.language = language
        self.counter = 0

    def to_teach(self, human):
        self.counter += 1
        return SoftwareDeveloper(human.name, human.gender, self.language)

    def get_how_many_times(self):
        print(f'We already trained how to use {self.language} {self.counter} person(s)')

class DebugSchool():
    def __init__(self, school):
        self.school = school

    def to_teach(self, human):
        return self.school.to_teach(human)

first = Human('Vasya', 'man')
first.introduce()
second = Human('Sveta', 'woman')
second.introduce()
third = Human('Mobile-1', 'helicopter')
third.introduce()

js_dev_school = DeveloperSchool('JS')
cpp_dev_school = DeveloperSchool('C++')
py_dev_school = DeveloperSchool('Python')

first = js_dev_school.to_teach(first)
first.introduce()

second = js_dev_school.to_teach(second)
second.introduce()

third = cpp_dev_school.to_teach(third)
third.introduce()

debug_school_python = DebugSchool(py_dev_school)
first = debug_school_python.to_teach(first)
first.introduce()

js_dev_school.get_how_many_times()
cpp_dev_school.get_how_many_times()