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

/start

/learn

/learn

. But if they add a space or adds anything. It won't be able to detect it using

switch

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.

Detecting only the first letter in a scanner

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Detecting only the first letter in a scanner

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