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: ['8739', 'K']

Answer: 8739


Question: ['6121', 'S', '8683', 'Y', '6107', 'B', '6193', '5555', '365', '945', '1439', '7257', 'g']

Answer: 42665


Question: ['8493', '6917', '5193', 'h', 'G', '737', '4577', '4621', '1179', 'p', 'z', 'u', 'V', '5079', 'b', 'j', '5475', '6917', 't', 'D']

Answer:
49188