How sharp is your Swift?

What does this print?

protocol Greeter {
    func hello()
}

extension Greeter {
    func hello() { print("protocol hello") }
    func hi() { print("protocol hi") }
}

struct English: Greeter {
    func hello() { print("English hello") }
    func hi() { print("English hi") }
}

let g: Greeter = English()
g.hello()
g.hi()

A taste of the format. The real bank adapts to your rating.