class BCD{
	private int[] number;
	private String reverse;
	BCD(int[] bcdDigits){
		number = new int[bcdDigits.length];
		for (int counter = 0; counter < bcdDigits.length; counter++)
			number[counter] = bcdDigits[counter];
		System.out.println(reverse = toString());
	}
	//bcdDigits.numberOfDigits
	//private setstring(String num){

	//}
	public int numberOfDigits(){
		return number.length;
	}
	public int nthDigit(int n){
		return number[n];
	}
	public String toString(){
		String back = "";
		int counter = 0;
		if (number.length%3 == 0)
			counter = 0;
		else if (number.length%3 == 1)
			counter = 1;
		else
			counter = 2;
		for(int x = number.length; x >= 1; x--){
			counter += 2;
			back = back + nthDigit(x - 1);

		if (counter%3 == 0 && x != 1)
				back = back + (",");
		}


		//System.out.println(back);
		return back;
	}
	public void addADigit(int newdigit){
		int counter;

		int[] array = new int[number.length + 1];

		for (counter = 0; counter < number.length; counter++){
			array[counter] = number[counter];
		}
		array[number.length] = newdigit;
		number = array;

		//for (counter = number.length; counter >= 0; counter--)
			//number[counter] = array[counter];
		toString();

		//bcdDigits

		// array.length % 3 = remander
		// if remander = 0 then z = 0
		// if remandfer = 1 then z = 1
		//if remander = 2 then z = 2


	}
	public static void main(String[] args){
		int[] num = {0};
		int[] num1 = {1};
		int[] num2 = {1, 2};
		int[] num4 = {1, 2, 3, 4};
		int[] num6 = {1, 2, 3, 4, 5, 6};
		int[] num7 = {1, 2, 3, 4, 5, 6, 7};
		BCD Num = new BCD(num);
		BCD Num1 = new BCD(num1);
		BCD Num2 = new BCD(num2);
		BCD Num4 = new BCD(num4);
		BCD Num6 = new BCD(num6);
		BCD Num7 = new BCD(num7);
		System.out.println(Num.addADigit(1));
		System.out.println(Num4.addADigit(2));
		System.out.println(Num4.addADigit(3);
		//for (int counter; counter < num.length; counter++)
			//BCD num[counter] = new BCD;

	}
}