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: ['7763', '6003', 'V']

A: 13766
****
Q: ['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']

A: 35729
****
Q: ['P', 'O', '7139', 'U', 'Q', '1209', 'B', 'Z', 'E', '4293']

A:
12641
****