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: ['8667', '4129', '7075', '6345', '1315', 'M', 'F', '9073']

Answer: 36604


Question: ['V', 'h', '5549', 'K', 's', '8337', 'Y', '497', 'z', 'T', '4467', '6333', 'M', '1573', 'y', 'O', '5499', 's', 't', '6205']

Answer: 38460


Question: ['6747', '1167', '225', '5239', 'n', 'I', '6621']

Answer:
19999