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:
['1305', '1673', 'w']

Ex Output:
2978


Ex Input:
['2241', 'B', 'P', 'e', 'l', 'e', '9733', 'p', '2051', 'Y', 'H', 'g', '7029', 'c']

Ex Output:

21054