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: ['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']

Answer: 45451


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

Answer: 74579


Question: ['K', 'T', '2085', '7083', 'A', 'Q', 'Z', '3779', 'z', 'N', '1319', '3101', '8075', '9407', '2985', 'Y', '1275', '2501', 'p', '2525']

Answer:
44135