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', '9787', '7533', '9489', 'C', '1753', '5121', '1405', '9267', '4815', 's', '5887']

Ex Output:
55057


Ex Input:
['s', 'M', 'U', '5383']

Ex Output:
5383


Ex Input:
['3653', 'm']

Ex Output:

3653