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.

[EX Q]: ['c', '7415', '6253', '4477', 't', '9449', '7733', '2325', 'Z', '5413', 'q', 'm', 'R', '8619', '7289', '857', '7273', '7425']
[EX A]: 74528

[EX Q]: ['6121', 'S', '8683', 'Y', '6107', 'B', '6193', '5555', '365', '945', '1439', '7257', 'g']
[EX A]: 42665

[EX Q]: ['8793', '83', 'A', '5155', 'g', '7853', 'M', 'Q', '8315', '9983']
[EX A]:
40182