The government published the following stem-and-leaf plot showing the number of sloths at each major zoo in the country: $ \left| \quad \begin{matrix} 0 \vphantom{\Large{0}} \\ 1 \vphantom{\Large{0}} \\ 2 \vphantom{\Large{0}} \\ 3 \vphantom{\Large{0}} \\ 4 \vphantom{\Large{0}} \\ \end{matrix} \quad \right| \quad \begin{matrix} 3& \vphantom{\Large{0}} \\ 6&7&7& \vphantom{\Large{0}} \\ 0&4& \vphantom{\Large{0}} \\ 0&1&1&2&4&7&9&9& \vphantom{\Large{0}} \\ 1&2&3&5&7& \vphantom{\Large{0}} \\ \end{matrix} $ ** How many zoos have fewer than $18$ sloths? ** [[☃ numeric-input 1]] zoos