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.

['G', 'o', 'g', 'I', 'S', '9193', 'G', 'C', '2481', '435', 'm', '1005', '5605', '6501', 'D']
25220

['4975', 'M', 'C', 'D', 't', 'i', 't', 'L']
4975

['6073', '7725', '7437', 'm', '793', 'y', 'o', '3667', 'g']

25695