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: ['u', 'B', '2509', 'U', 'R', '7497', '1897', '8697', 't', 'W', '1021', '7937', 'F', 'g', '6901', 'I', '2957']

Answer: 39416


Question: ['T', '4023', 's', '487', 'M', 'D']

Answer:
4510