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.

[EX Q]: ['6867', 'x', '8481', '5091', '979', 'a', 'S', 'i', 'd', '1591']
[EX A]: 23009

[EX Q]: ['3469', 'n', '5561', '8597', '921', '4737', 'r', 'P', '7127', '3651', 'D', '1703', 'y']
[EX A]: 35766

[EX Q]: ['e', 'q', 'P', '2729', 'n', '6829', 'W']
[EX A]:
9558