class FirstUnique:

$"""$A data structure to efficiently track the first unique number in a stream of

numbers."""

def $\_\_$init$\_\_($self$,$ nums$)$:

$"""$

Initialize the FirstUnique object with the numbers in the data stream.

:param nums: List$[$int$]-$ A list of integers representing the data stream.

$"""$

# TODO: Implement this method.

def add$($self$,$ number$)$:

$"""$

Add a new number to the data stream.

:param number: int $-$ The number to be added to the data stream.

$"""$

# TODO: Implement this method.

def showFirstUnique$($self$)$:

$"""$

Return the first unique number in the data stream.

If there is no such number, return $-1.$

:return: int $-$ The first unique number, or $-1$ if no unique number exists.

$"""$

# TODO: Implement this method.

return $-1$

# NOTE: DO NOT MODIFY THE METHOD NAMES OR PARAMETERS.

# Your implementation will be auto$-$graded based on these method signatures.class FirstUnique:

$"""$A data structure to efficiently track the first unique number in a stream of

numbers."""

def $\_\_$init$\_\_($self$,$ nums$)$:

$"""$

Initialize the FirstUnique object with the numbers in the data stream.

:param nums: List$[$int$]-$ A list of integers representing the data stream.