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]: ['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']
[A]: 21509


[Q]: ['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']
[A]: 45451


[Q]: ['v', 'x', 'N', 'W', '4187', 'x', 'c', 'f', 'k', '8205', 'i', '8331', '6599', '4937', '2397', 'N']
[A]:
34656