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Message: <blockquote data-quote="EKGuest" data-source="post: 28429950" data-attributes="member: 582168">This problem looks easy at the first glance but it is not. A few questions:<ol> <li data-xf-list-type="ol">What are the constraints? What are the valid characters in the input sentence?</li> <li data-xf-list-type="ol">Can the input contain both capital and simple letters? Or only capital letters?</li> <li data-xf-list-type="ol">What are the valid punctuation marks for this particular problem?</li> <li data-xf-list-type="ol">Can the sentence contain multiple numbers like 5000, 123, 47, so that each number should be flipped and doubled separately?</li> </ol></blockquote>

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