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:
['n', 'u', '9595', 'M', 'o', 'K', '5073', 'x']

Ex Output:
14668


Ex Input:
['A', '9775', '5867', 'n', '1329', '5973']

Ex Output:
22944


Ex Input:
['5673', '9339', '2719', '6663', '3643', 'P', '4271', '6139', 'N', '1491', '2443', '2115', '8175', 'G', '7405', '3163', '9475', '2021']

Ex Output:

74735