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: ['z', 'E', 'u', '4437', '7767']

Answer: 12204


Question: ['4401', 'p', 'V', 'l', 'H', '7329', 's', '4717', 'l', '1773', '67', '179', 'l', '6991', 'a', '9377']

Answer: 34834


Question: ['9171', '6867', 'c', 'E', '4265', '3033', 'X', '9645']

Answer:
32981