source = """This is the input string, example for the markov chain repeater. and this will be the source for what is to come as a result of the program"""

def s_format(_string):
  table = str.maketrans('','',"""!@#$%^&*()_+-=~`[]{}\\|;:",./<>?""")
  return _string.lower().translate(table)


def make_dict(_string):
  word_dict = dict()
  words = _string.split()
  for i, word in enumerate(words):
    try:
      word_dict[word] = words[i + 1]
    except IndexError:
      word_dict[word] = '.'
      return word_dict


def main():
  formatted = s_format(source)
  wd = make_dict(formatted)
  print(wd)

main()