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]: ['M', '9387', '7125', 'c', '1295', 'X', 'l', '9867']
[A]: 27674


[Q]: ['1305', '1673', 'w']
[A]: 2978


[Q]: ['V', '8137', 'b', 'k', '2081', 'L', '9733', '7525', 'D', '2381', 'O']
[A]:
29857