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I implemented the check50 to check the correctness of my vigenere's cipher program and received the following prompt:

:( rejects "Hax0r2" as keyword
\ expected output, not a prompt for input

What has been rejected? I didn't get the meaning of the error.. Please explain.

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This particular test is looking to see if your program rejects keywords with non-alphabetical characters. See this line from the pset specs:

This program must accept a single command-line argument: a keyword, k, composed entirely of alphabetical characters.

Add a section to your code that tests this condition (much like testing that argc is exactly 2), and you'll be set.

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