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: ['61', '5695', 'u', '253', 'n', '1035', 'd', '3017']

Answer: 10061


Question: ['x', 'd', '5121', 'I', '6737', '3789', '6167', 'C', '8947', 'k', '4715', '1885', 'H', 'B', '5685', 'S', '4615', 's', '7709']

Answer: 55370


Question: ['8159', '5353', '3413', '6243', 'M', '4137', '2429', '9357', '1283', 'D', '1429', '2475', '9157', 'H', 'u', '7049', '3821', '7091']

Answer:
71396