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: ['d', '4553']

Answer: 4553


Question: ['A', '9979', '8723', '1131', 'i', 'p', 'M']

Answer: 19833


Question: ['m', 'T', 'Z', 'b', '8369', '7309']

Answer:
15678