2956. Find Common Elements Between Two Arrays

class Solution:
    def findIntersectionValues(self, nums1: List[int], nums2: List[int]) -> List[int]:
        set1 = set(nums1)
        set2 = set(nums2)
        a = 0
        b = 0
        
        for i in nums1:
            if i in set2:
                a += 1

        for i in nums2:
            if i in set1:
                b += 1

        return [a,b]