import java.util.Scanner;
public class Main{
public static void main(String[] args){
// Please Enter Your Code Here
Scanner s = new Scanner(System.in);
int num1 = s.nextInt();
int num2 = s.nextInt();
int num3 = s.nextInt();
int num4 = s.nextInt();
int[][] arr = new int[num1][num1];
int xNum;
int yNum;
for (int i=1;i<=num1;i++){
for (int j=1;j<=num1;j++){
xNum = i - num2;
yNum = j - num3;
if (xNum < 0) xNum *= -1;
if (yNum < 0) yNum *= -1;
if (i == num2 && j == num3){
System.out.print("x" + " ");
}
else if (xNum + yNum <= num4 && xNum + yNum > 0){
System.out.print(xNum + yNum + " ");
}
else {
System.out.print(0 + " ");
}
}
System.out.println();
}
}
}