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]: ['s', 'd', 't', '8235', '2279', '7477', '3029', '4377', '9153', '4309', '2295', '407']
[EX A]: 41561

[EX Q]: ['7771', 'g']
[EX A]: 7771

[EX Q]: ['2733', 'L', '5563', '4819']
[EX A]:
13115