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.

['q', '867', 'e', 'z']
867

['6849', 'I', 'p', 's', 'L', '4757', 'j', 'x', 'm', 'P', '5237', '1105', '9015', '9279', 'Q']
36242

['911', 'k', 'F', 'n', 'h', 'N']

911