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.
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Question: ['6629', 'o', 'e', '497', '4865', '8733', '5733', '7337', 'N']

Answer: 33794


Question: ['s', 't', 'W', '163', 'v']

Answer: 163


Question: ['a', 'w', 'M', '2159', 'u', 'd', 'j', 'X', 'f', 'P']

Answer:
2159