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: ['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']

Answer: 28458


Question: ['k', 'a']

Answer: 0


Question: ['o', '3435', 'T', '2273', '7363']

Answer:
13071