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:
['s', 't', 'W', '163', 'v']

Ex Output:
163


Ex Input:
['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']

Ex Output:
27756


Ex Input:
['n', 'v', 'i', 'd', 'N', 'R', '5629', '4913']

Ex Output:

10542