Classify the following text as either constructive or unconstructive feedback.
Your last project was a complete failure and you should have prepared better.
Unconstructive feedback.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following text as either constructive or unconstructive feedback.

### Input:
Your last project was a complete failure and you should have prepared better.

### Output:
Unconstructive feedback.