package q1114

type Foo struct {
	one, two chan struct{}
}

func NewFoo() *Foo {
	return &Foo{
		one: make(chan struct{}),
		two: make(chan struct{}),
	}
}

func (f *Foo) First(printFirst func()) {
	// Do not change this line
	printFirst()

	close(f.one)
}

func (f *Foo) Second(printSecond func()) {
	<-f.one

	/// Do not change this line
	printSecond()

	close(f.two)
}

func (f *Foo) Third(printThird func()) {
	<-f.two

	// Do not change this line
	printThird()
}