Given a paragraph, list all of the nouns.
The cat tracked dirt into the house as it explored.
1. cat
2. dirt
3. house
4. (it)
Complete the following task based on the instruction and optional input provided.### Instruction:
Given a paragraph, list all of the nouns.

### Input:
The cat tracked dirt into the house as it explored.

### Output:
1. cat
2. dirt
3. house
4. (it)