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.

Q: ['291', 'R', 'N', '983', '2879', 'C', '3797', '4837', '793', '5489', 'k', '535', 'L', '3605', 's', '3701', 'U', '4399', '2489', '4739']

A: 38537
****
Q: ['G', 'o', 'g', 'I', 'S', '9193', 'G', 'C', '2481', '435', 'm', '1005', '5605', '6501', 'D']

A: 25220
****
Q: ['M', 'Y', '6589', '2079', 'H', 'B']

A:
8668
****