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: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']

A: 15614
****
Q: ['D', 'G', '9895', '143', '37', 'S', '1539', 'x', 'a', 'x', 'B', 'i', '9719', '839']

A: 22172
****
Q: ['t', '485', 'e', '5195', 'H', '8377', 'R', 'm', '8733', '6921']

A:
29711
****