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: ['e', '9777', '1835', 'N', '2425', '1427', 'o', '4459', '9961', '3285', '5199', 'x', 'e', '7727']

Answer: 46095


Question: ['8667', '4129', '7075', '6345', '1315', 'M', 'F', '9073']

Answer: 36604


Question: ['89', '5965', '9463', 'k']

Answer:
15517