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.

['2913', 'b', 'j', '7591', 'O', 's', '5589', '4995', '7503', 'U', 'S', 'C', '6797']
35388

['339', 'h', 'd', '7449', 'e', 'u', '5055', '7029', '9009', 'G', 'U', '3', '441', '3273', 'K', '3827', '7069', 'x']
43494

['r', 'E', 's', 'Y', '6659', 'E', '6911', 'T', 'y', 'C', '7359', '4531']

25460