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.

['8529', '2657', '1599', 'b', '8187', '7005', '7481']
35458

['291', 'R', 'N', '983', '2879', 'C', '3797', '4837', '793', '5489', 'k', '535', 'L', '3605', 's', '3701', 'U', '4399', '2489', '4739']
38537

['T', 'm', 'y', 'w', '4965', 'm', 'Y', 'o', '241', 'D', '8505', 'm', 'M']

13711