You may go to the next section.
Right.
What happens if there aren't four characters in the input?
The answer, like most other such problems, is that an exception is raised;
we'll find out later how to deal with exceptions.
You may go to the next section.
You may also:
Go back to the question
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Go up to the outline of lesson 8
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David A. Wheeler (dwheeler@ida.org)