import java.util.Scanner;
import java.io.PrintStream;
import type.lib.ToolBox;

public class BuyAndSell
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		PrintStream output = System.out;
		
		output.print("Buy: ");
		int buy = input.nextInt();
		output.print("Sell: ");
		int sell = input.nextInt();
		boolean crash = sell > buy;
		ToolBox.crash(crash, "You cannot sell more than you buy");
	}
}