def inter$\_$unique$($lst$1,$ lst$2)$:

$"1.".$

$$ inter$\_$unique $([3,5,7,6],[3,3,3,3])$

$[]$

$$ inter$\_$unique $([3,5,7,6],[-4,0,22,6,5,3])$

$3,5,6$

$$ inter$\_$unique $([3,5,7,6],[-4,0,22,6,5,3,3,3])$

$5,6$

$$ inter$\_$unique $([3,5,7,6],[-14,10,56])$

$[]$

#$---$ YOUR CODE STARTS HERE

passou may use the built$-$in method count$()$