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]: ['6367', '9923', '9141']
[EX A]: 25431

[EX Q]: ['9869', '7701', 'H', 'o', 'v', '1431', 'O', 'L']
[EX A]: 19001

[EX Q]: ['9819', '709', '5379']
[EX A]:
15907