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.

['D', 'm', 'P', '2433', '6731']
9164

['s', '3607', 'p', 'P', '9285', 'J', 'l', '9863', '9823', '2817', 'g', '9751', '599', '2605', 'k', 'Y', 'O', 'U', '9649']
57999

['y', '1237', 'Z', 'v', 'C', 'F', '3793', 'h', 'R', 'j', 'S', '4215', '57', '8493', 'W', 'b', 'Z', 'L']

17795