Tickets

CodeChefRating 1332Open on judge ↗

Every day, Mike goes to his job by a bus, where he buys a ticket. On the ticket, there is a letter-code that can be represented as a string of upper-case Latin letters. Mike believes that the day will be successful in case exactly two different letters in the code alternate. Otherwise, he believes that the day will be unlucky. Please see note section for formal definition of alternating code.

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