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: ['211', '7561', '8725', '6139', 'I', '6585', '4231', 't', '2983', 'T', 'S', '9569', 'R', 'b', 'N', 'X', '9009']

Answer: 55013


Question: ['W', 'H', 'k', 'L', '2425']

Answer: 2425


Question: ['6245', 's']

Answer:
6245