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:
['2915', '4443', 'Z', '3409', '1417', 'H', 'T', 'u', '3373', 'U', '115', 'R']

Ex Output:
15672


Ex Input:
['6293', 'o']

Ex Output:
6293


Ex Input:
['7601', 'I', 'E', 'C', 'T', '4631', '2217', '3535', '4085', '3527', '663', '6267', 'B', 'U', 'd', 'f', '9111', 'F', 'A', '9081']

Ex Output:

50718