Tanu and Head-bob

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Tanu has got interested in signs and gestures that we use for communication. One such gesture is the head-bob. When we want to signal "Yes" to someone, we move the head up-and-down. For "No", the head is moved left-and-right, rotating about the vertical axis. There is a peculiar way of gesturing "Yes", commonly seen in India, by moving head sideways (rotating about the forward-back axis). This is

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solution.cppC++17

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