2X2SquaresInMatrix

using System;
using System.Linq;

namespace _02_SquaresInMatrix
{
    class Program
    {
        static void Main(string[] args)
        {
            var sizes = Console.ReadLine()
                .Split()
                .Select(int.Parse)
                .ToArray();

            var rows = sizes[0];

            var cols = sizes[1];

            var matrix = new char[rows, cols];

            var numOfSquares = 0;

            for (int r = 0; r < matrix.GetLength(0); r++)
            {
                var chars = Console.ReadLine()
                    .Split()
                    .Select(char.Parse)
                    .ToArray();

                for (int c = 0; c < matrix.GetLength(1); c++)
                {
                    matrix[r, c] = chars[c];
                }
            }

            for (int r = 0; r < matrix.GetLength(0) - 1; r++)
            {
                for (int c = 0; c < matrix.GetLength(1) - 1; c++)
                {
                    if (matrix[r, c] == matrix[r, c + 1]
                        && matrix[r, c] == matrix[r + 1, c]
                        && matrix[r, c] == matrix[r + 1, c + 1])
                    {
                        numOfSquares++;
                    }
                }
            }
            Console.WriteLine(numOfSquares);
        }
    }
}