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: ['5215', 'c', '839', 'V']

A: 6054
****
Q: ['8263', 'R', 'r', 'N', 'r', '2189']

A:
10452
****