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]: ['S', '1249', '6233', 'I', '6733', 'r', 'A', 'E', 'h', 'x', 'p', 'c', '515', '1029', '1593', '1035']
[A]: 18387


[Q]: ['w', 'I', 't', '813', 'K', '5785']
[A]: 6598


[Q]: ['q', '527', 'x']
[A]:
527