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]: ['s', '3607', 'p', 'P', '9285', 'J', 'l', '9863', '9823', '2817', 'g', '9751', '599', '2605', 'k', 'Y', 'O', 'U', '9649']
[EX A]: 57999

[EX Q]: ['5233', 'i', 'Z', 'v', '4531', 'j', '61', '1725', '5915', '1677', 'F', 'K', 'M', 'Z']
[EX A]: 19142

[EX Q]: ['7829', 'V', 'L', '3201', '8147', 'm', 'e', 'P', '6991', '8157', 'p', 'X', '5111', 'T', 'b', '3509', '6777', 's', '5831', 'z']
[EX A]:
55553