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: ['I', 'J', 'K', 'D', '5961']

A: 5961
****
Q: ['7771', 'g']

A: 7771
****
Q: ['8985', '2845', 'V', 'T', '739', 'z', '3731']

A:
16300
****