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:
['o', '8089', '2159', '943', '1255', 'w', 'Y', '3723', 'n', '7767', '2209', 'F', 'c', 'J', '5259', '4427', 'n', 'U']

Ex Output:
35831


Ex Input:
['D', 'R', 'Y', '4929', 'P', '7929']

Ex Output:
12858


Ex Input:
['V', '5779', '7081']

Ex Output:

12860