number_of_lines = lambda filename: len(open(filename, 'r').readlines())


def number_frequency(filename):
  result = {}
  for number in open(filename, 'r').read().splitlines():
    if not number in result: result[number] = 0
    result[number] += 1
  return result


if __name__ == "__main__":
  print(number_of_lines('numbers.txt'))
  frequencies = number_frequency('numbers.txt')
  for key in frequencies:
    print(f'{key}: {frequencies[key]}')