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: ['i', 'w', '8117', '2823', 'C', 'x', 'w', '5959', 'g', 'e', 'L', 'V', 'i', 'w', 'n']

Answer: 16899


Question: ['2787', '6085', '6989']

Answer: 15861


Question: ['v', '7989']

Answer:
7989