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]: ['3351', '6445', 'Y', '8455', 'V', 'z', 'a', 'V', 'S', '8551', '4101', 'q', '8743', '5999', '7155', '3825', '2241', '9957']
[EX A]: 68823

[EX Q]: ['J', 'S', 'S', 'U', 'w', '7691', '7529', 'B', '3861', '4557', 'd', '569', '1547']
[EX A]: 25754

[EX Q]: ['4643', '8913', 'k', '9943', '1495', '5107', 'i', '8763', 'u']
[EX A]:
38864