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: Sainsbury's has said its chief executive Justin King is to leave the supermarket chain in July, after 10 years at the head of the company.

Sainsbury's boss Justin King to step down in July