import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

class Node{
    double x,y;
    double t;


    public Node(double x, double y, double t) {
        this.x = x;
        this.y = y;
        this.t=t;
    }

    public void write(){
        System.out.print("("+x+","+y+")"+"["+t+"C]");

    }
    public void write_wo_temp(){
        System.out.print("("+x+","+y+")");

    }

}

class Element{
    Node[] ID;
    int [] idW;

    public Element() {
        ID=new Node[4];
        ID[0]=new Node(555,555,14);
        ID[1]=new Node(555,555,11);
        ID[2]=new Node(555,555,142);
        ID[3]=new Node(555,555,134);
        idW=new int[4];
    }





    public void write(){
        ID[0].write();
        ID[1].write();
        System.out.println();
        ID[2].write();
        ID[3].write();
        }

    public void write_wo_temp(){
        System.out.print(idW[0]);
        ID[0].write_wo_temp();
        System.out.print(idW[1]);
        ID[1].write_wo_temp();
        System.out.println();
        System.out.print(idW[2]);
        ID[2].write_wo_temp();
        System.out.print(idW[3]);
        ID[3].write_wo_temp();
     }
    }

class Grid {

    double h,l;
    int nH,nL;
    int  nh;
    int ne;
    Element[] elementy;


    public Grid(double h,double l, int nH, int nL){




        this.h= h;
        this.l=l;
        this.nH=nH;
        this.nL=nL;
        nh=nL*nH;
        ne=(nL-1)*(nH-1);
        elementy=new Element[ne];
        for(int i=0;i<ne;i++)
            elementy[i]=new Element();

    }
    public void generate() {


        int pom_i=0;
        double i=0;
        double j=0;
        int inH=0;
        int inL=0;
        int idw=0;



        while(pom_i<ne){


            if(j==(h)){
                i+=l/(nL-1);
                j=0;

            }


            elementy[pom_i].ID[0].x=i;
            elementy[pom_i].ID[0].y=j;
            i+=l/(nL-1);



            elementy[pom_i].ID[1].x=i;
            elementy[pom_i].ID[1].y=j;
            j+=h/(nH-1);
            elementy[pom_i].ID[2].x=i;
            elementy[pom_i].ID[2].y=j;
            i-=l/(nL-1);
            elementy[pom_i].ID[3].x=i;
            elementy[pom_i].ID[3].y=j;


            pom_i++;

        }


       /* int iterator_w=0;
        int n=0;
        int z=0;


        while(n<ne){


            z=0;
            elementy[n].idW[z]=iterator_w;
            z++;
            iterator_w++;
            elementy[n].idW[z]=iterator_w;
            iterator_w++;
            z++;


            elementy[n].idW[z]=iterator_w;
            iterator_w++;
            z++;
            elementy[n].idW[z]=iterator_w;
            iterator_w++;
            z++;

            n++;
            iterator_w-=2;
        }
*/

        int iterator_w=0;
        int n=0;
        int z=0;





    }



    public void generateid() {
        Element[] temp=new Element[ne];
        for(int i=0;i<ne;i++){

            temp[i]=new Element();
        }


        int j=0;
        int i=0;
        int inH=0;
        while(i<ne){
            inH++;
            if(inH==nH) {
                j++;
                inH=1;
            }
            temp[i].idW[0] = j;
            temp[i].idW[1] = j + nH;
            temp[i].idW[2] = j + nH + 1;
            temp[i].idW[3] = j + 1;

            elementy[i].idW = temp[i].idW;



            j++;
            i++;



        }
    }

    public void write(){
        for(int i=0;i<ne;i++) {
            System.out.print("\n nr elementu:"+(i+1)+"\n");
            elementy[i].write();
        }

    }
    public void write_wo_temp(){
        for(int i=0;i<ne;i++) {
            System.out.print("\n nr elementu:"+(i+1)+"\n");
            elementy[i].write_wo_temp();
        }

    }

}

public class MES_GRID_2 {

    public static void main(String[] args) throws FileNotFoundException{

/* odczyt z danych nastepujacy= l h nL nH*/

        double l,h;
        int nL,nH;

        File file = new File("dane.txt");
        Scanner in = new Scanner(file);

        l = Double.parseDouble(in.nextLine());
        h = Double.parseDouble(in.nextLine());
        nL=Integer.parseInt(in.nextLine());
        nH=Integer.parseInt(in.nextLine());
        Grid siatka=new Grid(h,l,nH,nL);



        siatka.generate();
        siatka.generateid();
        siatka.write_wo_temp();




    }




}