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]: ['9787', '1491', '4411', '5261', 'U', '9787', 'b']
[EX A]: 30737

[EX Q]: ['9445', '7291', 'r', 'g', '1175', '7823', '5507', 'j', '7249', '6335', '3853', 'b', 'u', 'S', '365', 'Z', '7489', 'S', 'W', 'e']
[EX A]: 56532

[EX Q]: ['g', '3541', 'X', 'j', 'N', 'B', 'd', 'O', '3963', 'a']
[EX A]:
7504