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:
['D', 'b', 'h', 'p', '1637']

Ex Output:
1637


Ex Input:
['w', '7301', '9411', 'z', 'g', 'X', '1045', 'l', 'F', 'M', 'R', '7957', 'e', '5145']

Ex Output:
30859


Ex Input:
['f', 'w']

Ex Output:

0