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

Ex Output:
2978


Ex Input:
['339', 'h', 'd', '7449', 'e', 'u', '5055', '7029', '9009', 'G', 'U', '3', '441', '3273', 'K', '3827', '7069', 'x']

Ex Output:
43494


Ex Input:
['1339', 'D', 'Q', '7731', 'J', '6977', '2869', 'K', '2719', 'S', '7667', 'U', 'k', '3351', '1589', '9645']

Ex Output:

43887