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: ['b', 'W', 'V', 'R', '3761', 'U', '4553', '1803', 'W', '7775', '1067', 'Y', 'D', '3159']

Answer: 22118


Question: ['887', '8133', 'X', '2253', '8461', 'I', '5425', 'Z', 'z', 'r']

Answer: 25159


Question: ['897', 'I', '8435', 'j']

Answer:
9332