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: ['3469', 'n', '5561', '8597', '921', '4737', 'r', 'P', '7127', '3651', 'D', '1703', 'y']

Answer: 35766


Question: ['l', 'V']

Answer: 0


Question: ['5305', '5417']

Answer:
10722