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]: ['1001', 'T', 'w', 'f', 'Q', '4035', 'b', 'q', 'x', 'R']
[EX A]: 5036

[EX Q]: ['8361', '6757', '5341', '2597', '9803', 'a', 'd', '5889', '9823', 'd', '7947', 'y', 'p']
[EX A]: 56518

[EX Q]: ['951', 'K', '9303', '3489', 'R']
[EX A]:
13743