Classify this sentence as a sentence fragment, dependent clause, independent clause, etc.
The first sentence of the book.
This sentence is an independent clause, as it contains a subject ("the first sentence") and a verb ("is") and can stand alone as a complete thought.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify this sentence as a sentence fragment, dependent clause, independent clause, etc.

### Input:
The first sentence of the book.

### Output:
This sentence is an independent clause, as it contains a subject ("the first sentence") and a verb ("is") and can stand alone as a complete thought.