package com.telerikacademy;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class MatrixTask {
    static int count;
    static List<Integer> results = new ArrayList<>();

    public static boolean inBounds(int [][] grid, int row, int column){
        return (row >= 0 && column >= 0 && row < grid.length && column < grid[0].length);
    }

    public static void getCount(int [][]grid, int row, int column){

        if (!inBounds(grid, row, column)) {
            return;
        }
        if(grid[row][column]== 0) {
            return;
        }

        if (grid[row][column]==1) {
            count++;
            grid[row][column] = 0;
        }
        getCount(grid, row+1, column);
        getCount(grid, row-1, column);
        getCount(grid, row, column+1);
        getCount(grid, row, column-1);
    }

    public static void getElements(int [][] grid){

        for (int i = 0; i <grid.length ; i++) {
            for (int j = 0; j <grid[0].length; j++) {
                count = 0;

                if(grid[i][j] == 0) {
                    continue;
                } else {
                    getCount(grid, i, j);
                    if (count!= 0) {
                        results.add(count);
                    }
                }
            }

        }
    }

    public static void main(String[] args) {
        Scanner scanner  = new Scanner(System.in);
        int rows = Integer.parseInt(scanner.nextLine());
        int columns = Integer.parseInt(scanner.nextLine());
        int [][] grid = new int [rows][columns];

        for (int i = 0; i <rows; i++) {
            String input = scanner.nextLine();
            String [] arr = input.split("");
            for (int j = 0; j <columns; j++) {
                grid[i][j] = Integer.parseInt(arr[j]);
            }
        }

        getElements(grid);
        Collections.sort(results, Collections.reverseOrder());
        if (!results.isEmpty()) {
            for (int i = 0; i < results.size(); i++) {
                System.out.printf("%s\n", results.get(i));
            }
        } else {
            System.out.println("0");
        }
    }
}