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: ['J', 'm', '1255', 'S']

A: 1255
****
Q: ['4515', '3911', 'M', 'T', 'w', 'F']

A: 8426
****
Q: ['n', '1117', 'x']

A:
1117
****