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well,
in the example:
all the characters of the string "aaaaaaaghhhhjkll" are not unique–more than 1 "a"
>> "Deja Vu"
in 1st test case:
"asd" — all characters are unique (that's 1–a, 1–s, 1–d)
>> "Unique"
in 2nd test case:
"sammich" – we have 2 "m"
>> "Deja Vu"