04. Matrix Shuffling from C# Advanced

using System;
using System.Linq;

namespace _4._Matrix_Shuffling
{
    class Program
    {
        static void Main(string[] args)
        {
            var matrixSizes = GetMatrixSizes();

            int rows = int.Parse(matrixSizes[0]);
            int cols = int.Parse(matrixSizes[1]);

            string[,] matrix = ReadMatrix(rows, cols);

            string command = Console.ReadLine();

            while (command?.ToLower() != "end")
            {
                string[] tokens = command.Split(" ", StringSplitOptions.RemoveEmptyEntries);
                if (tokens.Length == 5 && tokens[0] == "swap" && int.Parse(tokens[1]) < rows && int.Parse(tokens[2]) < cols)
                {
                    int firstRow = int.Parse(tokens[1]);
                    int firstCol = int.Parse(tokens[2]);
                    int secondRow = int.Parse(tokens[3]);
                    int secondCol = int.Parse(tokens[4]);

                    string temp = matrix[firstRow, firstCol];
                    matrix[firstRow, firstCol] = matrix[secondRow, secondCol];
                    matrix[secondRow, secondCol] = temp;
                    PrintMatrix(matrix);
                }
                else
                {
                    Console.WriteLine("Invalid input!");
                    command = Console.ReadLine();
                    continue;
                }

                command = Console.ReadLine();
            }
        }

        private static void PrintMatrix(string[,] matrix)
        {
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    Console.Write(matrix[row, col] + " ");
                }

                Console.WriteLine();
            }
        }

        static string[] GetMatrixSizes()
        {
            string[] matrixSizes = Console.ReadLine()
                .Split(" ", StringSplitOptions.RemoveEmptyEntries);


            return matrixSizes;
        }

        static string[,] ReadMatrix(int rows, int cols)
        {
            string[,] matrix = new string[rows, cols];

            for (int row = 0; row < rows; row++)
            {
                string[] inputArr = GetMatrixSizes();

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

            return matrix;

        }
    }
}