He spent the day in a melancholy mood.

He was walking around the room melancholically.

He has been melancholy recently and doesn't feel like enjoying anything.

The calculation result caused a digit overflow.

His idea was completely extraordinary.

His performance was truly extraordinary.

Please tell me the last four digits of your phone number.

How many digits is his phone number?

There is not a single cloud in the sky.

The sky is very beautiful, isn't it?