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: ['M', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']

A: 40372
****
Q: ['m', '3481']

A: 3481
****
Q: ['4209', '2773', 'Z', 'v']

A:
6982
****