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: ['7755', '8383', 'y', 'k', '4869', '2809']

A: 23816
****
Q: ['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']

A: 28458
****
Q: ['815', 'D', 'r', 'u']

A:
815
****