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]: ['543', '8351', 'I', 'M', '6647', '731', 'b', 'r', 'l', '3935', 'k', 'z', 'v', '2131', '7781', 'X', '9419', '5013', 'F']
[EX A]: 44551

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

[EX Q]: ['7343', '1149', 'l', '4177', '7947', '2673', '5415', 'E', '6727', '8765', '309', '4327', '5751']
[EX A]:
54583