import stanford.karel.*;

public class CheckerboardKarel extends SuperKarel {
    public void run() {
        while (frontIsClear()) {
            putBeeper();
            advancedMove();
            advancedMove();
        }
    }
    private void advancedMove() {
        if (frontIsClear()) {
            move();
        } else {
            if (facingNorth()) {

            } else {
                if (facingEast()) {
                    turnLeft();
                    if (frontIsClear()) {
                        move();
                        turnLeft();
                    }
                } else {
                    if (facingWest()) {
                        turnRight();
                        if (frontIsClear()) {
                            move();
                            turnRight();
                        }
                    }
                }
            }
        }
    }
}