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.

['C', '3133', '2183', '5793', '9305', 'd', 'g', '6501']
26915

['9787', '1491', '4411', '5261', 'U', '9787', 'b']
30737

['K', 'K', 'A', 'H', 'd', '7443', 'l', '659', 'x', 'D', '193']

8295