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: ['b', 'i', '7807', 'g', '1611', '6733', 'V', '561', 'C', '8575', 's', 'E', '8129', 'F']

Answer: 33416


Question: ['k', 'a']

Answer: 0


Question: ['F', '8859', 'O', 'j', 'P', 's', '7793', 'P', 'Z', 'h', '4441', '6489', 'x', '9139', '5477']

Answer:
42198