Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
Contrary to the other reviewers, my experience has not been positive.  It is impossible to keep this knife sharp.  Purchased this knife and the next smaller knife.  Bought the sharpener of the same brand.  The sharpener apparently does not work.

Used another sharpener and that also fails to sharpen the knives.  Once dulled, the knives remain quite dull.

The knives will not stay sharp and they do not sharpen well.

Very disappointed.  Would not have purchased had I known this beforehand.

That is why I consider these knives not worth the money.

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