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]: ['n', 'u', '9595', 'M', 'o', 'K', '5073', 'x']
[A]: 14668


[Q]: ['t', 'v', 'B', 'Y']
[A]: 0


[Q]: ['1981', 'Y', '8475', '4927', 'f', 'a', 'n', '2669', 'm', '5905', '7681', '867', '739', '3877', 'k']
[A]:
37121