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:
['1875', '9833', 'i', '7493', 'J', 'P', 'z']

Ex Output:
19201


Ex Input:
['c', '7415', '6253', '4477', 't', '9449', '7733', '2325', 'Z', '5413', 'q', 'm', 'R', '8619', '7289', '857', '7273', '7425']

Ex Output:
74528


Ex Input:
['q', 'm', '3319', '4393', '2757', 'V', '5521', '3151', 'p', 'a', 'A', 'H']

Ex Output:

19141