In the given sentence, identify the underlined words as an example of an adjective or adverb.
He sang beautifully.
In the given sentence, the word "beautifully" is underlined and it is an example of an adverb.
Complete the following task based on the instruction and optional input provided.### Instruction:
In the given sentence, identify the underlined words as an example of an adjective or adverb.

### Input:
He sang beautifully.

### Output:
In the given sentence, the word "beautifully" is underlined and it is an example of an adverb.