def display_menu():
    print('The following operations are available:\n')
    print('1)  Madlibs Haiku')
    print('2)  Color Combination')
    print('3)  BMI Calculator')
    print('4)  Exit\n')

def madlibs_haiku(noun, season, adjective, animal):
    print(noun + ' on water')
    print('The sound of ' + season)
    print(adjective + ' ' + animal)

def color_combination(primary1, primary2):
    if primary1 == primary2:
        print('Error, please provide different colors')
    elif (primary1 == 'yellow' or primary2 == 'yellow') and (primary1 == 'blue' or primary2 == 'blue'):
        print('Green')
    elif (primary1 == 'red' or primary2 == 'red') and (primary1 == 'yellow' or primary2 == 'yellow'):
        print('Orange')
    elif (primary1 == 'red' or primary2 == 'red') and (primary1 == 'blue' or primary2 == 'blue'):
        print('purple')
    else:
        print('Error, one of your inputs was an invalid color')

def compute_bmi(weight, height):
    BMI_OFFSET = 703
    return (BMI_OFFSET * weight)/height**2

def assess_bmi(bmi):
    if bmi <= 18.5:
        return 'Underweight'
    elif bmi <= 24.99:
        return 'Normal Weight'
    elif bmi <= 29.99:
        return 'Overweight'
    elif bmi <= 34.99:
        return 'Obesity (Class 1)'
    elif bmi <= 39.99:
        return 'Obesity (Class 2)'
    else:
        return 'Morbid Obesity'

def main():
    display_menu()
    choice = int(input('What is your choice?  '))
    if choice == 1:
        noun = input('What is your noun?  ')
        season = input('What is your season?  ')
        adj = input('What is your adjective?  ')
        animal = input('What is your animal?  ')
        madlibs_haiku(noun, season, adj, animal)
    elif choice == 2:
        primary1 = input('what is your first color (red, yellow, or blue)?  ')
        primary2 = input('what is your second color (red, yellow, or blue)?  ')
        color_combination(primary1, primary2)
    elif choice == 3:
        height = float(input('What is your height?  '))
        weight = float(input('What is your weight?  '))
        bmi = compute_bmi(weight, height)
        print('Your BMI is:  ' + str(bmi))
        print('Your BMI classification is:  ' + assess_bmi(bmi))
    elif choice == 4:
        pass
    else:
        print('invalid choice')

main()