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: ['2787', 'z', '9351', '3339']

Answer: 15477


Question: ['N', 'e', '4283', '3243', '5581', '1407', 'q', 'y', '6685', 'v', 'c', '5995']

Answer: 27194


Question: ['45', 'i']

Answer:
45