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: ['3145', 'C', '7725', 'k', 'z']

A: 10870
****
Q: ['h', '1157', 'm', '8975', '6165', '7491', '1855', '3489', '9629', '631', '9641']

A: 49033
****
Q: ['7123', 'P', 'a', '401', '543', '6521', 'j', 'k', '7599', '3873', '733', 'i', '9575', 'G']

A:
36368
****