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.

['1671', 'H', '9271']
10942

['n', '6729', 'p', 'D', 'o', '1213', 'e', '6951', '2341', '9997', 'e', 'M', 'x', 'R']
27231

['D', '7807', '9395', 'T', 'c', '5139', '2827', 't', 'T', 'm', '3717', 'U', '3225', '7419', '2481', 'p', 'C', '5277']

47287