Write a program in the file liftoff.py that prints out the calls for a spaceship that is about to launch. Countdown from 10 to 1 and then output Liftoff!

Your program should use a for loop.

Here's a sample run of the program:

$ python liftoff.py
10
9
8
7
6
5
4
3
2
1
Liftoff!

-------

def main():
    for i in range(10,0,-1):
        print(i)
    print("Liftoff!")

if __name__ == '__main__':
    main()
