This is a type string captcha.
You have to type a string.
Number::Spell Perl extension for spelling out numbers http://search.cpan.org/~lhoward/Number-Spell-0.04/Spell.pm
Lingua::EN::Numericalize Replaces English descriptions of numbers with numerals http://search.cpan.org/~ecalder/Lingua-EN-Numericalize-1.52/Numericalize.pm
Lingua::EN::WordsToNumbers convert numbers written in English to actual numbers http://search.cpan.org/~joey/Lingua-EN-Words2Nums-0.14/Words2Nums.pm http://search.cpan.org/~emartin/Lingua-EN-WordsToNumbers-0.11/lib/Lingua/EN/WordsToNumbers.pm
To install Authen::PluggableCaptcha, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Authen::PluggableCaptcha
CPAN shell
perl -MCPAN -e shell install Authen::PluggableCaptcha
For more information on module installation, please visit the detailed CPAN module installation guide.