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: ['R', 'C', 'S', 'x', '1529', 'r']

Answer: 1529


Question: ['a', 'm', '3205', '1869', '1117', 'K', '5785']

Answer: 11976


Question: ['R', 'X', 'l', '3881', '6037', 'Q', 'v', 'Q', '5795', 'd', 'Y', '1847', '4867', 'S', 'z', 'C', '4203', 'C']

Answer:
26630