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: ['u', 'B', '2509', 'U', 'R', '7497', '1897', '8697', 't', 'W', '1021', '7937', 'F', 'g', '6901', 'I', '2957']

A: 39416
****
Q: ['i', 'w', '8117', '2823', 'C', 'x', 'w', '5959', 'g', 'e', 'L', 'V', 'i', 'w', 'n']

A: 16899
****
Q: ['S', 'E', '7701', 'S', 'c', '1531', '3951', '9405', 'N', '3015', 'H', 'S', 'o', '2183', '8205', 'b', 'P', '8645', 'a']

A:
44636
****