#
#  Compute the median of a collection of values entered by the user.
#

#
#  Read all of the values from the user and store them in a list.
#

# Read the first value from the user
line = input("Enter a number: ")
# Create an empty list to store the values
data = []

# While the user has not entered a blank line
while line != "":
  # Convert the entered value to a floating point number
  num = float(line)

  # Add the number to the list of values
  data.append(num)

  # Read the next line from the user
  line = input("Enter a number: ")

#
#  Sort the values.
#
data.sort()

#
#  Report the median.
#
if len(data) == 0:
  # No values were entered
  print("The median cannot be computed because no values were entered.")
elif len(data) % 2 == 0:
  # An even number of values were entered so the median is the average
  # of the two middle values
  median = (data[len(data) // 2] + data[len(data) // 2 - 1]) / 2
  print("The median value is", median)
else:
  # An odd number of values was entered so the median is the middle value
  median = data[len(data) // 2]
  print("The median value is", median)