message: Added comments  and read input
  I have added comments to the code explaining the logic.
  Also since the question requires an input, I have added the input.
diff: @@ -5,16 +5,19 @@ de ja vu
  """
  def dejavu(string):
  - if len(string) == len(set(string)):
  + if len(string) == len(set(string)): #set() removes duplicates from a string. So if set(string) is same as actual string, then it is unique
  return "Unique"
  - elif len(string) > len(set(string)):
  + elif len(string) > len(set(string)): #Else, it contains duplicates and hence not unique
  return "DeJa Vu"
  +str = input() # getting input
  +print(dejavu(str))
  +
  # Test Case 1
  -print(dejavu("aaafhgi"))
  +# print(dejavu("aaafhgi"))
  # Test Case 2
  -print(dejavu("cakemog"))
  +# print(dejavu("cakemog"))
  # Test Case 3
  -print(dejavu("caakemog"))
  \ No newline at end of file
  +# print(dejavu("caakemog"))
  