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', 'w', '2783', '6993', 'd', '9173']
[EX A]: 18949

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

[EX Q]: ['1141', '6995', 'Y', '1315', '9377', '1939', 'm', '8003', '9057', '5387']
[EX A]:
43214