building

package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int numberOfFloors = Integer.parseInt(scanner.nextLine());
        int roomsPerFloor = Integer.parseInt(scanner.nextLine());
        for (int i = numberOfFloors; i > 0; i--) {
            int counter = 0;
            for (int n = roomsPerFloor; n > 0; n--) {
                    if (i == numberOfFloors) {
                        System.out.printf("L%d%d ", i, counter);
                        counter++;
                } else if (i % 2 == 0) {
                        System.out.printf("O%d%d ", i, counter);
                        counter++;
                    } else {
                        System.out.printf("A%d%d ", i, counter);
                        counter++;
                    }
                }
            System.out.printf("%n");
            }
        }
    }