Q: What would be the ★-rating of this review (★ being the lowest and ★★★★★ being the highest)? "It is the best it is a complete world on its own.Better than any other messaging apps i have used n still using."
A: ★★★★★


Q: What would be the ★-rating of this review (★ being the lowest and ★★★★★ being the highest)? "Total waste of time"
A: ★


Q: What would be the ★-rating of this review (★ being the lowest and ★★★★★ being the highest)? "Great  but... Could we have the ability to save a list of devices we have  like you cab favourite guides? That way we could go straight to guides for a specific device we have."
A: ★★★★★


Q: What would be the ★-rating of this review (★ being the lowest and ★★★★★ being the highest)? "I LOVE IT because I can do my school work from home!"

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A: ★★★★★