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: ['W', 'H', 'k', 'L', '2425']

A: 2425
****
Q: ['O', '6337', 'j', '6009', 'z']

A: 12346
****
Q: ['v', '7751', 'o', '387', '8119', '2293', 'Y', 'Q', 'Z', '4185', '3623', 'T', 'O', 'w', '123', 'f']

A:
26481
****