import math

def calculate_area(radius):
    return 4 * math.pi * radius ** 2

def calculate_volume(radius):
    return 4 / 3 * math.pi * radius ** 3

def calculate_radius(circumference):
    return circumference / (math.pi * 2)

def calculate_ball_properties(circumference):
    radius = calculate_radius(circumference)
    area = calculate_area(radius)
    volume = calculate_volume(radius)
    return area, volume

print("This program calculates the area and the volume of the ball, when we know it's circumference")
try:
    measurement = float(input("Enter ball circumference: "))
except ValueError:
    print("Input must be a plain number.")
else:
    ball_area, ball_volume = calculate_ball_properties(measurement)
    print("Volume:", round(ball_volume, 4))
    print("Surface area:", round(ball_area, 4))