100% Code:

using System;
using System.Linq;

namespace squaresInMatrix
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] dimensions = ConsoleParseInt();
            string[,] matrix = new string[dimensions[0], dimensions[1]];

            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                string[] currentRow = ConsoleParseString();

                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    matrix[row, col] = currentRow[col];
                }
            }

            int counter = 0;

            for (int row = 0; row < matrix.GetLength(0) - 1; row++)
            {
                for (int col = 0; col < matrix.GetLength(1) - 1; col++)
                {
                    if (matrix[row,col] == matrix[row, col +1]
                        && matrix[row, col] == matrix[row + 1, col]
                        && matrix[row + 1, col] == matrix[row +1 , col+ 1])
                    {
                        counter++;
                    }
                }
            }

            Console.WriteLine(counter);
        }

        static int[] ConsoleParseInt() =>
            Console.ReadLine()
            .Split(new char[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries)
            .Select(int.Parse)
            .ToArray();

        static string[] ConsoleParseString() =>
            Console.ReadLine().Split(new char[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries);
    }
}

;-)