using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string[] line = Console.ReadLine().Split(' ');

        int n = int.Parse(line[0]);

        int m = int.Parse(line[1]);

        int a = int.Parse(line[2]);

        int b = int.Parse(line[3]);

        int[,] heights = new int[n, m];

        for(int i = 0; i < n; i++)

        {

            line = Console.ReadLine().Split(' ');

            for(int j = 0; j < m; j++)

            {

                heights[i, j] = int.Parse(line[j]);

            }

        }

        var sites = new List<Site>();

        for(int i = 0; i < n - a + 1; i++)

        {

            for(int j = 0; j < m - b + 1; j++)

            {

                int minHeight = int.MaxValue;

                for(int p = 0; p < a; p++)

                {

                    for(int q = 0; q < b; q++)

                    {

                        if(heights[i + p, j + q] < minHeight)

                        {

                            minHeight = heights[i + p, j + q];

                        }

                    }

                }

                int gUnits = 0;

                for(int p = 0; p < a; p++)

                {

                    for(int q = 0; q < b; q++)

                    {

                        gUnits += (heights[i + p, j + q] - minHeight);

                    }

                }

                var site = new Site(i, j, gUnits);

                sites.Add(site);

            }

        }

        //Console.WriteLine(sites.Count);

        var sortSites = sites.OrderBy(s => s.GUnits).ToList();

        /*foreach(var site in sortSites)

        {

            Console.WriteLine(site.N + " " + site.M + " " + site.GUnits);

        }*/

        var cities = new List<Site>();

        bool[,] occupied = new bool[n, m];

        foreach(var site in sortSites)

        {

            bool isOccupied = false;

            for(int i = 0; i < a; i++)

            {

                for(int j = 0; j < b; j++)

                {

                    //Console.Write(occupied[i, j] + " " );

                    if(occupied[site.N + i, site.M + j])

                    {

                        isOccupied = true;

                        break;

                    }

                }

                //Console.WriteLine();

                if(isOccupied)

                {

                    break;

                }

            }

            if(!isOccupied)

            {

                cities.Add(site);

                for(int i = 0; i < a; i++)

                {

                    for(int j = 0; j < b; j++)

                    {

                        occupied[site.N + i, site.M + j] = true;

                    }

                }

            }

        }

        Console.WriteLine(cities.Count);

        foreach(var city in cities)

        {

            Console.Write((city.N + 1) + " ");

            Console.Write((city.M + 1) + " ");

            Console.WriteLine(city.GUnits);

        }

    }

}

​

public class Site

{

    public int N{get;set;}

    public int M{get;set;}

    public int GUnits{get;set;}

    public Site(int n, int m, int gUnits)

    {

        N = n;

        M = m;

        GUnits = gUnits;

    }

}