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: ['5947', 'n', '9431', '7629', '7643', 'N', '141', '2353', 'l', 'F', '9665', '9489', 'X', '4905', 'H', 'L', '985']

Answer: 58188


Question: ['Y', '263', '641', '1163', 'p', 'r', 'L', '4425', 'C', '7585']

Answer: 14077


Question: ['7683', 'a']

Answer:
7683