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: ['6347', '5495', '169', '9503', 'H', '571', '6105', 'X', 'r', 'e', '7369', 'a', 'd', '6999']

A: 42558
****
Q: ['4389', '8535', 'D', '6063', 'z', 'r', 'w', '5725', '291', 'a', '9059', '569', '2943', 'W']

A: 37574
****
Q: ['K', '1783', '5427', 'I', '1325', '4391']

A:
12926
****