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: ['9905', 'm', 'Q', 'S', 'T', '7821', '1773', '9515', '3963', '2931', '7023', '8677', '1739', 'O', '909', '9153', '8319', 'k', '2851']

A: 74579
****
Q: ['F', 'z', '1159', '345']

A: 1504
****
Q: ['7211', 'n', '879', 'W', 'p', '4177', 'V']

A:
12267
****