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]: ['l', 'B', 'Y', '7543', '5091', '1917']
[EX A]: 14551

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

[EX Q]: ['7585', '95', 'j', 'L', '3129', '7289', '6525', '583', 's', '3167', 'i']
[EX A]:
28373