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: ['1305', '1673', 'w']

A: 2978
****
Q: ['6815', 'A', '1055', '4687', '8675', '4615', 'a', '2127', 'w', 'l', 'J', '5025', 'c', 't', '9727', 'G', '8431']

A: 51157
****
Q: ['7197', 'M', '1511', '6829', 'g']

A:
15537
****