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

A: 51157
****
Q: ['Q', '8317', '8989']

A: 17306
****
Q: ['3121', 'j']

A:
3121
****