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: ['M', '9933', '9861', 'f', 'N', 'R', '7625', 'p', 'T']

Answer: 27419


Question: ['d', '7305', '8903', 'b', '7687', '6393', '6939']

Answer: 37227


Question: ['7487', '933', 'F', '2181']

Answer:
10601