Drupal : how to sort and display nodes grouping by first letter in view

I have a huge list of companies (nodetype : company, only field is title) that I want to display in a nice way groupping them by first letter like a dictionnary like this :

A
Abc company
Alot of work company

B
Beautiful company
Best company

Trying to find a way to do it in an elegent way; no module seems to exist for that. Any idea ?