Hi, just one thing ... line 11 needs to be revised as follows:
print "\tv\tlower case vowel\n\tV\tupper case vowel\n\tn\tnumb
+er\n\tp\tpunctuation mark\n\ta\tany character\n";
Otherwise your default ($numargs == 0) is showing "l" & "L" for vowels as well as letters.
Other than that ... I like this ... I'm keeping it!
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