class Field:
    def __init__(self, horizontal_index, vertical_index, state, cost):
        self.__horizontal_index = horizontal_index
        self.__vertical_index = vertical_index
        self.__state = state
        self.__cost = cost

    @property
    def state(self):
        return self.__state

    @property
    def cost(self):
        return self.__cost

    @property
    def horizontal_index(self):
        return self.__horizontal_index

    @property
    def vertical_index(self):
        return self.__vertical_index

    @state.setter
    def state(self, state):
        if state == "toPlow" or state == "toWater" or state == "toSeed" or \
                state == "toFertilize" or state == "toCut" or state == "TOOLS_FIELD" or state == "FUEL_FIELD":
            self.__state = state

    @cost.setter
    def cost(self, cost):
        if cost == 1 or cost == 2 or cost == 3 or \
                cost == 4 or cost == 5 or cost == 0:
            self.__cost = cost