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: ['X', 'u', 'B', '269', '9089', 'M', '5175', 'K']

Answer: 14533


Question: ['v', 'a', 'O', 'S', 'r', 'T', 'r', 'K', 'K', '7781', '1749']

Answer: 9530


Question: ['f', '1789', '4979', '8655', '5565']

Answer:
20988