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]: ['b', 'i', '7807', 'g', '1611', '6733', 'V', '561', 'C', '8575', 's', 'E', '8129', 'F']
[A]: 33416


[Q]: ['Q', '8317', '8989']
[A]: 17306


[Q]: ['P', 'Q', '1685', '5509', 'J', 'G', 'T', '9433', 'g', 'h', '1705', 'w', 't', 'T', '133']
[A]:
18465