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]: ['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']
[A]: 33888


[Q]: ['3839', 'D', '4741', 'L']
[A]: 8580


[Q]: ['1481', 'O', '4551', 'y', '3277', 'd', '8809', 'r', 'r', '5063']
[A]:
23181