iffy.py

try:
    age = int(input('How old are you? '))
except:
    print('invalid age')
    sys.exit(1)

drink_age = int(input('Drinking age? '))

if age < drink_age:
    print('Drink O.J. for you!')
else:
    bev = input('Wine or beer? ')
    if bev == 'w' or bev == 'W' or bev == 'wine':
        print('Chardonnary for you!')
    elif bev == 'b' or bev == 'B' or bev == 'beer':
        print('Corona for you!')
    else:
        print('Water for you!')

print('Return the glass when done')