import java.util.*;
public class flipping {

	static Scanner in;
	static double height;
	static double width;
    static double permHeight;
    static double permWidth;
	static double heightDivide;
	static double widthDivide;
	static flipping myFlip;

	
	public static void main(String[] args){
		myFlip=new flipping();
		
		in=new Scanner(System.in);
		int cases=1;
		try{
			while(true){
				String[] temp;
				
				temp=in.nextLine().split(" ");
				
				width=Double.parseDouble(temp[0]);
				height=Double.parseDouble(temp[1]);
				widthDivide=Double.parseDouble(temp[2]);
				heightDivide=Double.parseDouble(temp[3]);
				permHeight=height;
				permWidth=width;
				int numPoints=Integer.parseInt(in.nextLine());
				
				System.out.println("Case " + cases+":");
				for (int k=0; k<numPoints;k++){
					String[] tempPoint;
					tempPoint=in.nextLine().split(" ");
					Point curPoint=myFlip.new Point(tempPoint);
					
					height=permHeight;
					width=permWidth;
					System.out.println(myFlip.calc("black", curPoint));
					
				}
				cases++;
			}
		}
		catch(Exception e){
			
		}
		
	}
	
	public String calc(String color, Point curPoint){
		
		double hd= height*heightDivide;
		double wd= width*widthDivide;

		if (curPoint.getX()<=wd && curPoint.getY()>=hd)return color;
		if (curPoint.getX()>=wd && curPoint.getY()<=hd) return color;
			if (curPoint.getX()<wd){
				height=hd;
				width=wd;
			}
			else{
				height= height-hd;
				width= width-wd;
				curPoint.setX(curPoint.getX()-wd);
				curPoint.setY(curPoint.getY()-hd);
				
			}
			
			if (color.equals("white")) color="black";
			else if (color.equals("black")) color="white";
			
			return calc(color, curPoint);
		
		
		
		
	}
	
	public class Point{
		double x;
		double y;
		
		public Point(String[] points){
			x=Double.parseDouble(points[0]);
			y=Double.parseDouble(points[1]);
		}
		public double getX(){
			return x;
		}
		public double getY(){
			return y;
		}
		public void setX(double value){
			x=value;
		}
		public void setY(double value){
			y=value;
		}
	}
}