#include <iostream>
using namespace std;
int main()
{
	int n,m,k,i,j,buy = 0;
	double pi[10000],pi_m = 0,pi_n = 0;
	cin >> m >> n >> k;
	for(i = 1;i <= k;i++)
		cin >> pi[i];
	for(i = n;i <= k;i++){
		double sum_m = 0,sum_n = 0;
		int count = i;
		for(j = 0;j < m;j++)
			sum_m += pi[count--];
		sum_n = sum_m;
		for(j = m;j < n;j++)
			sum_n += pi[count--];
		pi_m = sum_m * 1.0 / m;
		pi_n = sum_n * 1.0 / n;
		if(pi_m > pi_n && buy == 0){
			cout << "BUY ON DAY " << i << endl;
			buy = 1;
		}
		else if(pi_m <= pi_n && buy == 1){
			cout << "SELL ON DAY " << i << endl;
			buy = 0;
		}
	}
	return 0;
}