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.

Q: ['w', '2281', '8651', '2203', 'q', 'n', '4253']

A: 17388
****
Q: ['3557', '3345', '307', '9791', '1897', 'O']

A: 18897
****
Q: ['O', 'a', 's', '1751', '9727', '5721', 'u', '6915', 'd', 'z', '5933', '7965']

A:
38012
****