3.2 база

class C32:
    def __init__(self):
        self.state: C32.State = C32.A(self)

    def bolt(self) -> int:
        return self.state.bolt()

    def group(self) -> int:
        return self.state.group()

    def tail(self) -> int:
        return self.state.tail()

    class State:
        def __init__(self, parent):
            self.parent: C32 = parent

        def bolt(self) -> int:
            raise RuntimeError

        def group(self) -> int:
            raise RuntimeError

        def tail(self) -> int:
            raise RuntimeError

    class A(State):
        def tail(self):
            self.parent.state = C32.B(self.parent)
            return 0

        def group(self):
            self.parent.state = C32.D(self.parent)
            return 1

    class B(State):
        def bold(self):
            self.parent.state = C32.C(self.parent)
            return 2

        def group(self):
            self.parent.state = C32.G(self.parent)
            return 3

        def tail(self):
            self.parent.state = C32.D(self.parent)
            return 4

    class C(State):
        def group(self):
            self.parent.state = C32.D(self.parent)
            return 5

    class D(State):
        def bold(self):
            self.parent.state = C32.E(self.parent)
            return 6

    class E(State):
        def bold(self):
            self.parent.state = C32.F(self.parent)
            return 7