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]: ['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']
[A]: 34764


[Q]: ['877', '6999', 'f', '5849', '5921', 'n', '2659', 'B', 'Y', 'c', 'g', '443', '9393', '6601', 'Z', '87', 'u', '2405']
[A]:
41234