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: ['1147', 'f']

Answer: 1147


Question: ['T', 'n', '8513', '5565', '6343', '1403', '975', '6959', '8049', '1601', 'j', 'Q', 'O', '7889', 'r', 'D', '1903', '6607']

Answer: 55807


Question: ['6219', '6699', '3383', '3161', '2379', '7107', '1377', 'x']

Answer:
30325