Tony Stark and Spam Callers

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Tony Stark has recently acquired a new phone. Ever since he has started using it, he has been plagued by spam callers and is finding it difficult to differentiate between spam calls and actual calls from the Avengers. To avoid confusion, he comes up with a way to differentiate between them. He observes that if the number of **distinct letters (case insensitive)** in the caller ID is **even**, i

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solution.cppC++17

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