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: ['E', 'X', 'C', 'v', '2803', 'g', 'b', '763']

Answer: 3566


Question: ['N', 'V', 't', 'X', 't', 'M']

Answer: 0


Question: ['D', '6089', '6093', '5221', 'u']

Answer:
17403