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]: ['I', 'J', 'K', 'D', '5961']
[EX A]: 5961

[EX Q]: ['B', 's']
[EX A]: 0

[EX Q]: ['o', 'I', '3619', '5965', '693', 'y', 'a', 'H', '7871', '6197', '6629', 'C']
[EX A]:
30974