Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: A US-backed alliance of Kurdish and Arab fighters says it has driven Islamic State (IS) militants out of 80% of the northern Syrian city of Raqqa.

Syria war: Assault on IS-held Raqqa in 'final stages'