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: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']

Answer: 26755


Question: ['8529', '2657', '1599', 'b', '8187', '7005', '7481']

Answer: 35458


Question: ['L', 'w', 'p', '73', '679', '6339', '2133', 'O', 'a', 'N', 'A', 'B']

Answer:
9224