def _aihub_coord_to_coord(coords):
    """Covert aihub-style coords to standard format.

    >>> _aihub_coord_to_coord({
    ...   "X좌표1": 602.004,
    ...   "X좌표2": 571.004,
    ...   "X좌표3": 545.004,
    ...   "X좌표4": 531.004,
    ...   "Y좌표1": 520.004,
    ...   "Y좌표2": 505.004,
    ...   "Y좌표3": 465.004,
    ...   "Y좌표4": 428.004,
    ... })
    [(602.004, 520.004), (571.004, 505.004), (545.004, 465.004), (531.004, 428.004)]
    """
    max_num = max(int(item[3:]) for item in coords)
    return [(coords[f"X좌표{n}"], coords[f"Y좌표{n}"]) for n in range(1, max_num + 1) if f"X좌표{n}" in coords]