#!/usr/bin/env python3

from typing import Optional, Union, NamedTuple


class Point(NamedTuple):
    x: Optional[int] = None
    y: Union[int, None] = None
    z: int | None = None


if __name__ == "__main__":
    print(Point(x=1))
    print(Point(y=1))
    print(Point(z=1))