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]: ['4177', 'd', 'b', 'm', 'f', 'R', '797', '7905', '4355', '7515', '9801', 'F', 'R', '9125', '8445', 'k', 'K', 'K']
[EX A]: 52120

[EX Q]: ['l', 'V']
[EX A]: 0

[EX Q]: ['4855', '4701', '3257', 'N', '9923', 'e', '7013', '161', '7573', '4745', '79', 'q', 'e', '1413', 'T', '1865', '6343', '2799', 'V', '1491']
[EX A]:
56218