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]: ['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']
[EX A]: 6713

[EX Q]: ['M', '9933', '9861', 'f', 'N', 'R', '7625', 'p', 'T']
[EX A]: 27419

[EX Q]: ['C', 'D', '9073', 'm', '4911']
[EX A]:
13984