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:
['3351', '6445', 'Y', '8455', 'V', 'z', 'a', 'V', 'S', '8551', '4101', 'q', '8743', '5999', '7155', '3825', '2241', '9957']

Ex Output:
68823


Ex Input:
['p', '4689']

Ex Output:
4689


Ex Input:
['j', '217', '5715', '9929', '5397', 'N', 'P', '3935']

Ex Output:

25193