how can I filter using pandas dataframes by multiple values in one column

I have a excel list, includes 2 columns (a and b), and it is 502000 rows. Also I have 2. list, includes 1 column (a), and it is 55 rows.

How can I filter 55 values using pandas dataframes by multiple values (55 values) in one column with 1. list, then write a different file?

Thanks