Decode The Reply

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Souhandya has a crush on a girl who is addicted with question mark and the number 3. Souhandya proposed the girl but the girl being shy replied by giving him a string $S$. He cannot understand the message so he consulted with you. Now you being the best friend of the girl as well as Souhandya know that if the string contains $3$ question marks between pair of any two numbers that add up to $9$ *

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solution.cppC++17

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