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: ['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']

A: 48859
****
Q: ['3683', 'U', 'x', '313', 'n', '3837', '3299', '2081', '2773', 'r', 'O', '257', '6647', '585', 'o']

A: 23475
****
Q: ['r', 'F', '3091', 'b']

A:
3091
****