#include <iostream.h>

long x;

void DisplayWithCommas(long Numb)
{
/*Displays proper commas in the correct places.
  Post: Commas put in the correct places of the user inputted number.*/
	if(( 0 < Numb) && (Numb < 1000))
	{
		cout << x;
	}
	else  if(Numb == 0)
	{
		cout << "000";
	}
	else
	{
		DisplayWithCommas(Numb/1000);
		cout << ",";
		DisplayWithCommas(Numb%1000);
	}
}

int main()
{
	cout << "Enter a number:";
	cin >> x;
	DisplayWithCommas(x);
	return(0);
}