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', '1589', '8353', 'X', 'P', '3173', 'V', '1335', 'm', 'l', '6421', '4823', 'r', '8941', '4255', '9107', 'z', '2449', '2321', 'l']

A: 52767
****
Q: ['7755', '8383', 'y', 'k', '4869', '2809']

A: 23816
****
Q: ['X', 'B', 'U']

A:
0
****