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: ['4389', '8535', 'D', '6063', 'z', 'r', 'w', '5725', '291', 'a', '9059', '569', '2943', 'W']

Answer: 37574


Question: ['o', '445', '2601', 'h', 'V', 'C', 't', 'o', 'H', '3707', '7601']

Answer: 14354


Question: ['x', 'M', '4087', 'A', '463', 'T', '4249', '8805', 'K', '4245', '6345', 'C', 'X', '9353', '6403', '4789', '7867', 'R', 't']

Answer:
56606