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: ['o', 'O', 'H', '7619', '6435', 'X', 'g', '1663']

Answer: 15717


Question: ['d', '4553']

Answer: 4553


Question: ['3739', 'c', '3941', 'T']

Answer:
7680