#include <iostream>
#include <iomanip>
#include <cstdlib>
using namespace std;

/*
Ten columns, each consisting of 100 rows
a.out | pr -10 -i' '1 -l100 -t -w80
*/

int main()
{
	for (int n = 1; n <= 1000; ++n) {
		bool closed = true;
		for (int i = 1; i <= n; ++i) {
			if (n % i == 0) {
				closed = !closed;
			}
		}

		cout << setw(4) << n << " " << (closed ? "C" : "O") << "\n";
	}

	return EXIT_SUCCESS;
}