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: ['3683', 'U', 'x', '313', 'n', '3837', '3299', '2081', '2773', 'r', 'O', '257', '6647', '585', 'o']

A: 23475
****
Q: ['3051', 'Z', 'q', 'u', 'x', '2747', 'e', 'B', '4225', 'Q', 'R', '4629', 'F']

A: 14652
****
Q: ['4681', 'Y', 'o', '9993', '9453', '7623']

A:
31750
****