Squares in Matrix

using System;
using System.Linq;

namespace Squares_in_Matrix
{
    class Program
    {
        static void Main(string[] args)
        {
            int [] dimensions = Console.ReadLine().Split(' ', StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();

            int rows = dimensions[0];
            int cols = dimensions[1];

            char[,] matrix = new char[rows, cols];

            for (int row = 0; row < rows; row++)
            {
                char[] currentRow = Console.ReadLine().Split(' ', StringSplitOptions.RemoveEmptyEntries).Select(char.Parse).ToArray();

                for (int col = 0; col < cols; col++)
                {
                    matrix[row,col] = currentRow[col];
                }
            }

            int count = 0;

            for (int row = 0; row < rows-1; row++)
            {
                for (int col  = 0; col  < cols-1; col ++)
                {
                    char currentChar = matrix[row,col];

                    if (currentChar == matrix[row, col + 1] &&
                       currentChar == matrix[row+1,col] &&
                       currentChar == matrix[row+1,col+1])
                    {
                        count++;
                    }
                }
            }

            Console.WriteLine(count);



        }
    }
}