captcha php code

Hi,

i’m looking for a nice way to had a captcha (recpatcha or simple catcha) into a child template of carbon light template.

On contact page there is a form already existing, i would like to add a captcha feature to make it more secured somehow.

any idea if a plugin could do that… i mean to have just the PHP code (like shortcode does) just to add in my php page code ?
thx