input: 
  def convert_to_dictionary(items_list):
      """Converts a given list of items into a dictionary where the keys are the items from the list
      and the values are their corresponding string representations.
      >>> convert_to_dictionary([1, 2, 3, 4])
      {1: 'one', 2: 'two', 3: 'three', 4: 'four'}
      >>> convert_to_dictionary([5, 6, 7, 8])
      {5: 'five', 6: 'six', 7: 'seven', 8: 'eight'}
      """
      items_dict = {item: 'unknown' for item in items_list}
      return items_dict
  
output:     number_to_word = {
          1: 'one',
          2: 'two',
          3: 'three',
          4: 'four',
          5: 'five',
          6: 'six',
          7: 'seven',
          8: 'eight'
      }
      for item in items_list:
          if item in number_to_word:
              items_dict[item] = number_to_word[item]
      return items_dict