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:
['E', 'v', 'l', 'c', 'g', '3929', 'q', 'j']

Ex Output:
3929


Ex Input:
['y', 'p', '3553', '2155', 'b', 'R', 'j', 'V', 'U']

Ex Output:
5708


Ex Input:
['k', '1489', 'x', '6543', 'I', 'l', 'D', '6299', '1473', 'a', '7661', 'z', 'E', 'Z', 'U', '3671', '2873', 'e', 'p']

Ex Output:

30009