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:
['9869', '7701', 'H', 'o', 'v', '1431', 'O', 'L']

Ex Output:
19001


Ex Input:
['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']

Ex Output:
48859


Ex Input:
['p', 'n', '9713', '257']

Ex Output:

9970