How to get identical words from variables?

Question

Python

There are two variables:

a = ('магазин, холодильник, утюг, бытовая техника,  стиральная машина')
b = ('шкафы, магазин, стулья, стиральная машина, язык, строка, холодильник')

How to get the same words from these two variables, in this case - a store, a refrigerator, a washing machine?

Answer 1

set(a.split(', ')) & set(b.split(', '))
(only double spaces can be a problem)