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: ['9403', 'u', '4159', 'w', '3467']

Answer: 17029


Question: ['O', 'K', 's', 'V', '6815', 'c', '9277', 'V', '1783', 'b', 'i', '2045', 'E', 'E', '2035']

Answer: 21955


Question: ['9803', '4817', '4837', 'G', 'i', 'H', '307', 'D', 'u', '7465', '5511', 'i', 'F', 'd', '3801', '6923', 'n']

Answer:
43464