Classify whether the following sentence follows the structure of active voice or not. Output 1 for active voice, and 0 for not.
The cat was hidden by the dog.
0 (The sentence is in passive voice)
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify whether the following sentence follows the structure of active voice or not. Output 1 for active voice, and 0 for not.

### Input:
The cat was hidden by the dog.

### Output:
0 (The sentence is in passive voice)