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: ['9903', 'H', '757', 'J', '6481', '9789', 'H', '3285', 'V', 'X', '5229', '7197']

Answer: 42641


Question: ['o', 'L', 'E', 'V', 'D', 's', 'Z', 'm', 'a', '2785', 'I', 'v', 'B', '7909', '1599', 'V', 'N']

Answer: 12293


Question: ['9795', 's', '2669', '161', 'z', '2425', 'O', 'n', '4937']

Answer:
19987