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]: ['8809', '4559', '2715', 'w', '9903', 'h', 'u', 'F', '9369', '6149']
[A]: 41504

[Q]: ['9749', '3689', 'f', '1491', 'w', '5149', 'k', 'q', '6685', 'X']
[A]:
26763