# This program distinguishes an unknown word at any place against two known words

list = ['I', 'am'] # two known words
entered_line = input('Enter the line')

def word_in_line(line): # checks if the line has a word in the begining

       new_word = ''  # dummy
       for x in line:
              new_word += x # adds from the begining of string

              if new_word in list: # to see if a word is formed
                     return True, new_word, line[len(new_word):] # returns true, the word found, and the rest of string
       else:
              return False, new_word # returning false means there is no known words in the begining of the string

def word_in_later(line): # checks if there is a word in the middle of the string

       left_word = ''  # dummy
       rest_of_line = line

       for x in range(0, len(rest_of_line)):
              left_word += rest_of_line[0] # takes one letter off at a time
              rest_of_line = rest_of_line[1:] # to make a new string

              if word_in_line(rest_of_line)[0] == True: # and checks if this now has a word
                     return left_word, word_in_line(rest_of_line)[1], word_in_line(rest_of_line)[2] # returns the left, the word, and the rest
              else:
                     continue


def final_line(line):

       final_line = ''

       if word_in_line(line)[0] == True:  # Is there a word in the begining ? yes
              final_line += word_in_line(line)[1] + ' ' # add that word
              rest = word_in_line(line)[2] # finds the rest of the string

              if word_in_line(rest)[0] == True: # is there a word in the begining of the rest ? yes
                     final_line += word_in_line(rest)[1] + ' ' + word_in_line(rest)[2] # adds this known word and the remaining unknown word
              else:
                     final_line += word_in_later(rest)[0] + ' ' + word_in_later(rest)[1] # No, meaning the unknown word is in the middle of 3
       else:
              final_line += word_in_later(line)[0] + ' ' + word_in_later(line)[1] + ' ' + word_in_later(line)[2] # means unknown word in begining

       return final_line

print(final_line(entered_line))