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


[Q]: ['5199', 'h', 'T', 'T', 'l', '1661', 'p']
[A]: 6860


[Q]: ['q', '7505', 'H', 'Z', 'c', '4521', '83', 'g', '701', 'h', 'B', '3099', '1735', '7727', 'N', 'z', '8777', 'P']
[A]:
34148