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:
['Q', '1767', '5523', 'I', '933', 'h', '2189', 'f', '7795', 'X', 'M', 'G', '1215', 'W', '8619']

Ex Output:
28041


Ex Input:
['7959', '1345', '4605', '6453', 'Q']

Ex Output:
20362


Ex Input:
['I', 'H', '3841', '9733', '3199', '6693', 'v', '6079', '725', '3143', '61', '659', '8781', 'U']

Ex Output:

42914