Edit the following sentence for grammar mistakes:
The cat and the dog are playing in the yard outside.
The cat and the dog are playing in the yard outside.
The sentence is already grammatically correct. No changes are needed.
Complete the following task based on the instruction and optional input provided.### Instruction:
Edit the following sentence for grammar mistakes:
The cat and the dog are playing in the yard outside.

### Input:
The cat and the dog are playing in the yard outside.

### Output:
The sentence is already grammatically correct. No changes are needed.