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: ['7361', '6913', '3605', '2081', '7619']

A: 27579
****
Q: ['M', '225', 'f', '7623', 'A', '7415', 'Y', '5061', 'd', 'G', '6015', 'J', '9081', '9967', 'I', 'U', '4341', 'F']

A:
49728
****