import UIKit

class Car {
    var color: String
    let model: String

    init(color: String, model: String) {
        self.color = color
        self.model = model
    }
}

class BigCar: Car {
    var passability: Int

    init(color: String, model: String, passability: Int) {
        self.passability = passability
        super.init(color: color, model: model)
    }
}

class Bus: Car {
    var numOfPass: Int
    init(color: String, model: String, numOfPass: Int) {
        self.numOfPass = numOfPass
        super.init(color: color, model: model)
    }
}

class Truck: Car {
    var liftingCap: Int
    init(color: String, model: String, liftingCap: Int) {
        self.liftingCap = liftingCap
        super.init(color: color, model: model)
    }
}

class NewTruck: Truck {
    private var numOfWheels: Int

    init(color: String, model: String, liftingCap: Int, numOfWheels: Int) {
        self.numOfWheels = numOfWheels
        super.init(color: color, model: model, liftingCap: liftingCap)
    }

    func getNumOfWheels() -> Int {
        return self.numOfWheels
    }

    private func setNumOfWeels(weels: Int) {
        self.numOfWheels = weels
    }
}


var cars: [Car] = [Car]()

cars.append(Truck(color: "Black", model: "e102", liftingCap: 1000))
cars.append(Bus(color: "White", model: "2001", numOfPass: 26))
cars.append(Truck(color: "Black", model: "e102", liftingCap: 1000))
cars.append(Bus(color: "White", model: "2001", numOfPass: 26))
cars.append(Truck(color: "Black", model: "e102", liftingCap: 1000))
cars.append(Bus(color: "White", model: "2001", numOfPass: 26))
cars.append(Truck(color: "Black", model: "e102", liftingCap: 1000))
cars.append(Bus(color: "White", model: "2001", numOfPass: 26))
cars.append(NewTruck(color: "hhh", model: "e101", liftingCap: 10000, numOfWheels: 10))


for car in cars {
    if car as? Truck != nil && car as? NewTruck == nil {
        if let truck = car as? Truck {
            print(truck.model)
        }
    }
}