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.

['6255', '8457', 'V', 'z', '4405', 'X', '9267', '5329', 'I']
33713

['6019', '1467', '3415', '7785']
18686

['8729', 'Q', 'y', 'U', '4727', '7019', '9659', 'o', 'A', '5223', '1841', '4547', '5433', '4991', 'S']

52169