The Fibonacci numbers (named after Leonardo di Pisa aka Fibonacci) are 1, 1, 2, 3, 5, ... where each subsequent number is the sum of the previous two.

One way to generate the Fibonacci numbers is the rabbits sequence. In the beginning, there are two child rabbits, one male and one female. Call this a "rabbit pair". They reproduce as follows:

At the start of each subsequent month, every mature pair of rabbits produces a new pair of newborn rabbits.
Rabbits become adults and are able to mate at one month old.
Rabbits are immortal--they never die.
Rabbits are always born in pairs--one male and one female.

Here is a table showing the number of adult rabbit pairs and child rabbit pairs each month.

Month	Adult pairs	Child pairs	Total pairs
1	0	1	1
2	1	0	1
3	1	1	2
4	2	1	3
5	3	2	5
6	5	3	8

Your job is to create a RabbitSimulator class that has all of the following:

Fields adults and children that represent the number of adult and child rabbit pairs;
A constructor that takes no inputs and sets the number of adults to 0 and children to 1;
A method advanceMonth() that ages rabbits by a month and produces corresponding changes to the number of adult and child rabbit pairs;
A method getRabbits that returns the number of rabbits;
A method toString() that returns a String that will be printed if a RabbitSimulator object is printed.

Here is some code for a separate Main class for testing

public class Main {

	public static void main(String[] args) {
		RabbitSimulator rabbits = new RabbitSimulator();
		System.out.println(rabbits);
		rabbits.advanceMonth();
		System.out.println(rabbits);
		rabbits.advanceMonth();
		System.out.println(rabbits);
		rabbits.advanceMonth();
		System.out.println(rabbits);
		rabbits.advanceMonth();
		System.out.println(rabbits);
		rabbits.advanceMonth();
	}
}