quotes = (
'A man is not complete until he is married. Then he is finished.', 
'As I said before, I never repeat myself.', 
'Behind a successful man is an exhausted woman.', 
'Black holes really suck...',
'Facts are stubborn things.'
) 
 
class QuoteModel: 
    def get_quote(self, n): 
        try: 
            value = quotes[n] 
        except IndexError as err: 
            value = 'Not found!' 
        return value 
 
class QuoteTerminalView: 
    def show(self, quote): 
        print(f'And the quote is: "{quote}"') 
 
    def error(self, msg): 
        print(f'Error: {msg}') 
 
    def select_quote(self): 
        return input('Which quote number would you like to see? ') 
 
class QuoteTerminalController: 
    def __init__(self): 
        self.model = QuoteModel() 
        self.view = QuoteTerminalView() 
 
    def run(self): 
        valid_input = False 
        while not valid_input: 
            try: 
                n = self.view.select_quote() 
                n = int(n) 
                valid_input = True 
            except ValueError as err: 
                self.view.error(f"Incorrect index '{n}'") 
        quote = self.model.get_quote(n) 
        self.view.show(quote) 
 
def main(): 
    controller = QuoteTerminalController() 
    while True: 
        controller.run() 
 
if __name__ == '__main__': 
    main()