Python 101: Selection challenge - Surface area or Volume

# Python 101 selection challenge: Cuboid volume\surface area

print("This code will help you work out the surface area, or volume, of a cuboid.\n")

routine = input("Would you like the surface area or volume of your shape? [Type S or V] ")
cube = input("Is your shape a cube? [Type Y or N] ")

side_1 = float(input("How long is your longest side? "))

if routine == "S":
    if cube == "Y":
        surface_area = side_1 * side_1 * 6
    elif cube =="N":
        side_2 = float(input("Looking at the end of the cuboid, what is the length of sides on the left\\right? "))
        side_3 = float(input("Still looking at the end, how long are the top\\bottom sides? "))

        end_areas = 2 * side_2 * side_3
        left_right_areas = 2 * side_2 * side_1
        top_bottom_areas = 2 * side_3 * side_1
        surface_area = end_areas + left_right_areas + top_bottom_areas
    else:
        surface_area = 0
    print("\nThe surface area is " + str(surface_area))
elif routine == "V":
    if cube == "Y":
        volume = side_1 ** 3
    else:
        side_2 = float(input("Looking at the end of the cuboid, what is the length of sides on the left\\right? "))
        side_3 = float(input("Still looking at the end, how long are the top\\bottom sides? "))
        volume = side_1 * side_2 * side_3
    print("\nThe volume is " + str(volume) + "\n")
else:
    print("\nInvalid selection")