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

Answer: 74579


Question: ['J', 'm', '1255', 'S']

Answer: 1255


Question: ['8465', '997', '5531', '7619', 'u', '5743', '9335', 'W', 'h', 'l', 'x', 'L', '6353', '9279']

Answer:
53322