Parse the following sentence for the subjects.
The dog sleeps on the couch.
The subject in the sentence "The dog sleeps on the couch." is 'The dog'.
Complete the following task based on the instruction and optional input provided.### Instruction:
Parse the following sentence for the subjects.

### Input:
The dog sleeps on the couch.

### Output:
The subject in the sentence "The dog sleeps on the couch." is 'The dog'.