Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
.They work as advertised, providing plenty of heat to boil the water for my Jensen Model 76 steam engine. However, they were advertised as something other people bought to fire their model steam engines. In fact, the cubes are too big to fit into the fuel tray under the boiler, but are easy to cut down to size.

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