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


[Q]: ['c', 'r', 'R', 'a', '6915', 'C', '3651', 'j', 'L', '9761', '2923', 'Z', 'e', '833', 'W', '1867', 'G', 'H', 'T']
[A]: 25950


[Q]: ['9001', '215', 'T', 'Y', 'u', 'C', 'Z', '2749', 'D', '9551', 'U', 'X', '661', '5801', 'R']
[A]:
27978