In the class definition, initialize the private fields greeting $($string$)$ and number $($integer$)$ with the default values "Void" and $-1,$ respectively.

Ex: If the input is Rob $5979170,$ then the output is:

Default values:

Greeting: Hello this is Void, Number: $-1$

After mutator methods:

Greeting: Hello this is Rob, Number: $5979170$