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: ['f', 'N', '8597', 't', 'K', '9755', 'j', '9747', '7259', '5493', 'n', '7269', '8493', '2279', '5369', 'f']

Answer: 64261


Question: ['q', '867', 'e', 'z']

Answer: 867


Question: ['3669', '7403', '9075', 'Z', '3637']

Answer:
23784