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:
['R', '3361', 'c', 'S', 'g', '3829', '7347', '6633', 'e', '9227']

Ex Output:
30397


Ex Input:
['6629', 'o', 'e', '497', '4865', '8733', '5733', '7337', 'N']

Ex Output:
33794


Ex Input:
['R', '6187', '8937', '2037', 'U', 'u', '6795', '8877', '3947', '1771', '2097', 'y', '8625', '1843', 'Z', 'f', '9821']

Ex Output:

60937