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: ['J', 'm', '1255', 'S']

Answer: 1255


Question: ['6577', 'Q', '6865', '7671', 'N']

Answer: 21113


Question: ['9593', '7865', 'p', '7861']

Answer:
25319