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:
['3883', 'T', '6175', 'B', '4365', '3719', 'V', 'B', '3173', 'K', 'Z']

Ex Output:
21315


Ex Input:
['d', '4553']

Ex Output:
4553


Ex Input:
['G', '7473', 'z', 'i', 'V', 'g', '621', 'K', '4473', 'd', '2711', '6609', 'q']

Ex Output:

21887