ROT13 Challenge

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This is a collection of ROT13 encoding programs written in different languages. Just for fun.

Feel free to participate - fork, add, pull request.

Your program should have I/O and that's how it's supposed to look (if possible):

Enter string to encode:
NOWHERE abjurer 123.
Encoded string:
ABJURER nowhere 123.

The file has to be named main.<lang_extension> if possible. It must be placed in the <Language Name> folder.