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: ['M', '1589', '8353', 'X', 'P', '3173', 'V', '1335', 'm', 'l', '6421', '4823', 'r', '8941', '4255', '9107', 'z', '2449', '2321', 'l']

Answer: 52767


Question: ['T', '721', '6555', 'g', 'y', 'U', '3053', 'A', '9663']

Answer: 19992


Question: ['U', '1301', '7431', '8217', '6019', 'B', '4221', '2663', 'N', 'k', '6837', '8805', 'F', '369', 'd', '2277', '6815', 's']

Answer:
54955