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]: ['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']
[A]: 15691


[Q]: ['k', 't', '4307', '9241', '9129', '2159', '4393', 'p', 's', 'B', 'H', '7289', '4655']
[A]:
41173