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: ['5233', 'i', 'Z', 'v', '4531', 'j', '61', '1725', '5915', '1677', 'F', 'K', 'M', 'Z']

Answer: 19142


Question: ['B', 'K', '9399', 't', '5541', 'w', '1939', '7841', 'q']

Answer:
24720