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]: ['3121', 'j']
[EX A]: 3121

[EX Q]: ['O', '6337', 'j', '6009', 'z']
[EX A]: 12346

[EX Q]: ['9675', '5755', 'i', 'k', 'i', '9611', '529', 'h']
[EX A]:
25570