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]: ['3145', 'C', '7725', 'k', 'z']
[A]: 10870


[Q]: ['135', 'a', 'X', '8067', '8447', '4009', '4221', 'o', 'A', 'x']
[A]: 24879


[Q]: ['f', '6703', 'c', 'c', 'l', '2511', '6507', 'b', '9727', 'l', '1251', 'I', '5231', '91', 'L', 'M', 'd']
[A]:
32021