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: ['B', 'K', '9399', 't', '5541', 'w', '1939', '7841', 'q']

A: 24720
****
Q: ['3873', 'D', 'J', '2799', 'k', 'F', 'I', '3457', '5647', '4815', '7509', 'Y', '1251', '2211']

A: 31562
****
Q: ['3943', '457', 'B', '5647', '603', 'o', 'E', '4825', 'I', 'I', '1973', 'J', 'c', 'o', '7497', 'X', '4747', '8369']

A:
38061
****