input: Write a function to calculate the average of five numbers entered by a user. The function should prompt the user to enter each number, and it should return the average. 
  assert calc_avg()=="Enter five numbers: 3, 4, 5, 6, 7\nThe average is 5.0"
  assert calc_avg()=="Enter five numbers: 10, 20, 30, 40, 50\nThe average is 30.0"
output: def calc_avg():
      numbers = input("Enter five numbers: ").split(", ")
      total = sum(map(float, numbers))
      average = total / 5
      return f"The average is {average}"