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: ['2787', 'z', '9351', '3339']

Answer: 15477


Question: ['6949', '5141', 'I', '8541', '1881', '8993', 't', 't', 'U', 'n', '1203', 'J', 'P', '3325', 'g', 'R', '7337', '7009', '7901']

Answer:
58280