import java.io.*;

public class GetBurnRate{
	public static void main(String[] args){
		System.out.println("#Welcome to Lunar Lander");
		try{
			BufferedReader inputReader = new BufferedReader(new InputStreamReader(System.in));
			
			int burnRate = 0;
			do{
				System.out.println("#Enter burn rate or <0 to quit:");
				try{
					String burnRateString = inputReader.readLine();
					burnRate = Integer.parseInt(burnRateString);
					System.out.println("%" + burnRate);
				}
				catch(NumberFormatException nfe){
					System.out.println("#Invalid burn rate.");
				}
			}while(burnRate >= 0);
			inputReader.close();
		}
		catch(IOException ioe){
			ioe.printStackTrace();
		}
	}
}