Classify the following sentence as an interrogative or a declarative sentence.
How are you doing today?
The sentence "How are you doing today?" is an interrogative sentence.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following sentence as an interrogative or a declarative sentence.

### Input:
How are you doing today?

### Output:
The sentence "How are you doing today?" is an interrogative sentence.