from typing import (
    List,
)

class Solution:
    """
    @param arrs: the arrays
    @return: the number of the intersection of the arrays
    """
    def intersection_of_arrays(self, arrs: List[List[int]]) -> int:
        # write your code here
        ans = set(arrs[0])
        for arr in arrs:
            ans &= set(arr)

        return len(ans)