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: ['C', '3133', '2183', '5793', '9305', 'd', 'g', '6501']

Answer: 26915


Question: ['N', 'V', 't', 'X', 't', 'M']

Answer: 0


Question: ['7117', '4573', '333', '2393', '7291', 'l', 'T', 'w', 'Y']

Answer:
21707