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: ['u', 'W', '1561', '9243', '4923', '9385']

Answer: 25112


Question: ['251', '2155', '5029', 'k', 'j', 'I']

Answer: 7435


Question: ['T', '4869', 'z', 'X', 'j', '1679', '3135', '2825', 't', '2281', 'u', 'R', 'E']

Answer:
14789