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.

[EX Q]: ['B', 's']
[EX A]: 0

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

[EX Q]: ['s', 'W', '9829', '8727', '689', '1091', '2625', '1599', 'l', 'l', '7065', '3237', '2281', 'P']
[EX A]:
37143