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]: ['U', '5607', 'Q', 'j', 'I', '3745', '3031']
[EX A]: 12383

[EX Q]: ['3495', 'G', 'H', 'F', '5267', '1865', 'T', 'L']
[EX A]:
10627