input: 
  def calculate_circle_area() -> float:
      """ Prompts the user to enter the value of the radius to calculate the area of a circle.
      Returns the calculated area.
      
      >>> calculate_circle_area()  # User inputs 5
      78.5
      """
      Pi = 3.14
      radius = float(input("Please enter the radius of the circle: "))
      area = Pi * radius**2
      print("The area of the circle is:", area)
      return area
  
output:     Pi = 3.14
      radius = float(input("Please enter the radius of the circle: "))
      area = Pi * radius**2
      print("The area of the circle is:", area)
      return area