override func viewDidLoad() {

super.viewDidLoad()

// Declare String value

let firstName:String = "Sergey"

// Declare Int value

let intNumber:Int=5

// Call the "takeAway()" function we have extended the Int class with:

print("5 take away 4 equals \(intNumber.takeAway(4))")

// Call the greatTheWorld() function we have extended the String class with

firstName.greatTheWorld()

}