In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.
--------
Question: ['x', 'V', 'g', '5469', 'c', '7873', 'T', 'p', '8109', '5395', 'h', 'z', 'T', '9373']

Answer: 36219


Question: ['2087', '8171', 'c', 'd', 'a', '5621', 'n']

Answer: 15879


Question: ['8639', '4141']

Answer:
12780