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.

['v', '9511', 'f', 'q']
9511

['B', '9189', '3691', '2869', '1525', 'd', 'H', 'P', '8613', 'b', 'r', '5289', 'V', '6433', '8733', 'K', '8105', '1041', 'U', 'L']
55488

['7297', 'R', '4841', '7403', '3761', '6243']

29545