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: ['I', '7815']

Answer: 7815


Question: ['6849', 'I', 'p', 's', 'L', '4757', 'j', 'x', 'm', 'P', '5237', '1105', '9015', '9279', 'Q']

Answer: 36242


Question: ['Q', 'D', '617', 'U', '715', 'g', 'M', '1535', 'j', '8687']

Answer:
11554