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]: ['4145', 't']
[A]: 4145


[Q]: ['2691', '3861', '7087', '4661', '6527']
[A]: 24827


[Q]: ['I', 'P', 'G', 'p', 'j', '1759', '3567', 'v', 'N', '6543', '5471']
[A]:
17340