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]: ['h', '9539', '3373']
[A]: 12912


[Q]: ['5829', '9755', '67', 'F', '6347', 'p', 'i', 'X', 'z', 'o', '2321', 'F', '6145', 'B', '3903']
[A]: 34367


[Q]: ['Z', 'F', 'o', '2339', 'n', '3707', '7013']
[A]:
13059