Instruction: Assess the user's sentiment in the provided review and select the appropriate sentiment option from the list as the answer.

Input:
I am SO happy with this purchase!  I live in a two-story townhome.  The a/c just doesn't cool the upstairs at all, making sleeping miserable for most of the summer.  Last night I installed this fan in one of the master bedroom windows around 5:30 pm, on the exhaust setting, and when I went upstairs around 7 pm it was almost as cool as downstairs!  At bedtime I turned off the a/c and set the fan to the intake setting, and enjoyed a pleasant night's sleep.  I've left it on the exhaust setting today while I'm at work, anticipating another humid day close to 90 degrees.  I look forward to seeing how it feels when I get home. (A/C is off during the day.)  I will be purchasing another one for the second bedroom, and recommended it to my neighbors as well.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive