Detecting only the first letter in a scanner

I made a course (Like it teaches and Tests Users Knowledge). And I just want to detect the first part of what they write. Like I made commands such as /start or /learn. But if they add a space or adds anything. It won't be able to detect it using switch. Is it possible to just detect the first part? Or the first letter? Because The Exams to answer the exam. You just put a letter like a, b, c, d. If they add a space it will say Unknown input.
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