class Square {
    var width: Float = 0.0

    required init(width: Float) {
        self.width = width
    }
}

class Circle {
    var radius: Float = 0.0

    required init(radius: Float) {
        self.radius = radius
    }
}

class Traingle {
    var width: Float = 0.0
    var height: Float = 0.0

    required init(width: Float, height: Float) {
        self.width = width
        self.height = height
    }
}