choice = raw_input('Enjoying the course? (y/n)')

while (choice != "y" and choice != "n"):  # Fill in the condition (before the colon)
    choice = raw_input("Sorry, I didn't catch that. Enter again: ")

choice = raw_input('Enjoying the course? (y/n)')

while (choice != "y" and choice != "n"):  # Fill in the condition (before the colon)
    choice = raw_input("Sorry, I didn't catch that. Enter again: ")

# Fill in the condition (before the colon)