Wordpless Plugin A to Z post navigation

Hi. Is there a WP plugin similar to WP-SNAP

https://www.nateomedia.com/wares/downloads/wordpress/wp-snap/

But, what I want is that.. the navigation is on the header, and for example after clicking A… all posts that starts with letter A will appear..

only post titles.. not the contents..

is there a plugin available for that feature? I don’t know how to write one.. and if it’s available.. I don’t know what it is called… need help anyone..

thanks ??