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

Ex Output:
74528


Ex Input:
['M', '9387', '7125', 'c', '1295', 'X', 'l', '9867']

Ex Output:
27674


Ex Input:
['f', '8131', '8319', 'O', 'C', 'a', 'O', 'v', 'M', 'Y', 'P', '7737']

Ex Output:

24187