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: ['n', 'm', 'Y', 'v']

Answer: 0


Question: ['y', 'R', 'b', 'v', 'm', 'H', '9903', '8689', 'D', '1023', 'a', '233', '1833', 'o', 'n', 'm', '5531']

Answer: 27212


Question: ['5901', 'n', '8241', 'D', 'B', 'D', '2189', 'r', '8519', '9905', '6887']

Answer:
41642