from enum import Enum


class ShipDirection(Enum):
    VERTICAL = 'VERTICAL'
    HORIZONTAL = 'HORIZONTAL'
    UNKNOWN = 'UNKNOWN'

    @staticmethod
    def from_string(raw_value):
        if raw_value:
            value = raw_value.upper()
            if value in ShipDirection.__members__:
                return ShipDirection[value]
        return ShipDirection.UNKNOWN