input: def removeDuplicates(input): 
      final_list = [] 
      for num in input: 
          if num not in final_list: 
              final_list.append(num) 
      return final_list 
  
  """
  >>> removeDuplicates([1, 2, 2, 3, 3, 4])
  [1, 2, 3, 4]
  >>> removeDuplicates([5, 5, 5, 5])
  [5]
  >>> removeDuplicates([1, 2, 3, 4, 5])
  [1, 2, 3, 4, 5]
  """
output:     return final_list