String Matrix Rotation

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace P12.StringMatrixRotation
{
    class StringMatrixRotation
    {
        private static char[,] matrix;

        static void Main()
        {
            int degrees = int.Parse(Regex.Match(Console.ReadLine(), "[0-9]+").ToString()) % 360;

            var tempList = new List<List<char>>();
            int rows = 0;
            int cols = 0;

            string inputRow;
            while ((inputRow = Console.ReadLine()) != "END")
            {
                if (inputRow.Length > cols)
                {
                    cols = inputRow.Length;
                }
                tempList.Add(inputRow.ToList());
                rows++;
            }

            //fill matrix
            matrix = new char[rows, cols];
            for (int r = 0; r < rows; r++)
            {
                for (int c = 0; c < cols; c++)
                {
                    try
                    {
                        matrix[r, c] = tempList[r][c];
                    }
                    catch (Exception)
                    {
                        matrix[r, c] = ' ';
                    }
                }
            }

            switch (degrees)
            {
                case 90:
                    matrix = rotate90degrees(matrix);
                    break;
                case 180:
                    matrix = rotate90degrees(matrix);
                    matrix = rotate90degrees(matrix);
                    break;
                case 270:
                    matrix = rotate90degrees(matrix);
                    matrix = rotate90degrees(matrix);
                    matrix = rotate90degrees(matrix);
                    break;
            }

            //print
            for (int r = 0; r < matrix.GetLength(0); r++)
            {
                for (int c = 0; c < matrix.GetLength(1); c++)
                {
                    Console.Write(matrix[r, c]);
                }
                Console.WriteLine();
            }
        }

        private static char[,] rotate90degrees(char[,] input)
        {

            int rows = input.GetLength(0);
            int cols = input.GetLength(1);
            char[,] output = new char[cols, rows];

            for (int r = 0; r < rows; r++)
            {
                for (int c = 0; c < cols; c++)
                {
                    output[c, rows - 1 - r] = input[r, c];
                }
            }
            return output;
        }
    }
}