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: ['4437', '1265', '1519', 'K', 'Q', 'b', 'n', 'J', '6631', 'K', 'q', 'D', 'U', 'u', '3653', '5169', 'L', 's']

Answer: 22674


Question: ['K', 'p', '97', 'R', '2999', 'u', '7307', '6033', '6431', 'm', 'T']

Answer: 22867


Question: ['r', '4753', '637', '7373', '3015', '1685', '6873', 'X', 'Q', 'C', 'o', '4917', 'T']

Answer:
29253