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: ['r', '3139', 'C', 'L', '7335', 'v', '9861', 'F']

A: 20335
****
Q: ['9905', 'm', 'Q', 'S', 'T', '7821', '1773', '9515', '3963', '2931', '7023', '8677', '1739', 'O', '909', '9153', '8319', 'k', '2851']

A: 74579
****
Q: ['w', '4789', '2025', 'V', 'Q', '8009', '1831', '8947', '7601', 'z', '5477', '6337', 'V', 'Y', '8207', 'z', 'p', 'f']

A:
53223
****