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 Input:
['t', '7469', 'Y', 'N', '8137']

Ex Output:
15606


Ex Input:
['D', 'G', '9895', '143', '37', 'S', '1539', 'x', 'a', 'x', 'B', 'i', '9719', '839']

Ex Output:
22172


Ex Input:
['2849', 'W', 'v', 'd', 'a', 'k', 'N', 'd', '1389', '927', '6695', 'a', '1701', 'A', '1643', '3769', 'L']

Ex Output:

18973