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: ['Z', '6245', 'N', '1403', 'b']

Answer: 7648


Question: ['3723', 'v', 'j', 'e', '2017', 'd', '4211', '2079']

Answer: 12030


Question: ['N', '8533', 'w', 'G', '9251', '7195', 'i', '5009', 'Z', '8553', '7385', 'C', '4513', '9303', '6615', 'b', '2949', '7833', 'U']

Answer:
77139