text: """
  Read file into texts and calls.
  It's ok if you don't understand how to read files.
  """
  import csv
  with open('texts.csv', 'r') as f:
      reader = csv.reader(f)
      texts = list(reader)
  
  with open('calls.csv', 'r') as f:
      reader = csv.reader(f)
      calls = list(reader)
  
  
  """
  TASK 1:
  How many different telephone numbers are there in the records? 
  Print a message:
  "There are <count> different telephone numbers in the records."
  """
  
  """
  count distinct telephone #'s in texts
  Worst Case Big-O is O(n) where n is the sum of the sizes of texts and calls.
  """
  num_list = []
  
  
  for record in texts:
      if record[0] not in num_list:
          num_list.append(record[0])
      if record[1] not in num_list:
          num_list.append(record[1])
  for record in calls:
      if record[0] not in num_list:
          num_list.append(record[0])
      if record[1] not in num_list:
          num_list.append(record[1])
  
          
  print("There are",len(num_list),"different telephone numbers in the records.")