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]: ['4159', 'H', 'h', 'W', 'w', 'i', 'G', 'l', 'j', '5467', '9219', 'j', 'q', 'n', '5465', '6197', 'J', 'y']
[A]: 30507


[Q]: ['8611', 'n', '8389', 'y', '7215', 'a', 'X', 'I', 'V']
[A]:
24215