12.String Matrix Rotation

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

public class Program
{
    public static void Main()
    {
        string input = Console.ReadLine();
        int degrees = int.Parse(Regex.Replace(input, "\\D+", "")) % 360;
        var lines = ReadLines();

        int maxLength = lines.Max(l => l.Length);
        int symbolsPerLine = degrees % 180 == 0 ? maxLength : lines.Count;
        int linesCount = degrees % 180 == 0 ? lines.Count : maxLength;

        lines = lines
            .Select(l => degrees == 180 || degrees == 270 ? ReverseString(l).PadLeft(maxLength) : l.PadRight(maxLength))
            .ToList();
        if (degrees == 90 || degrees == 180)
        {
            lines.Reverse();
        }

        StringBuilder output = new StringBuilder(symbolsPerLine * lines.Count);
        for (int i = 0; i < linesCount; i++)
        {
            for (int j = 0; j < symbolsPerLine; j++)
            {
                output.Append(degrees % 180 == 0 ? lines[i][j] : lines[j][i]);
            }
            output.AppendLine();
        }
        Console.WriteLine(output.ToString());
    }

    private static List<string> ReadLines()
    {
        List<string> lines = new List<string>();
        string input;
        while (!(input = Console.ReadLine()).Equals("END"))
        {
            lines.Add(input);
        }
        return lines;
    }
    private static string ReverseString(string s)
    {
        char[] symbols = s.ToCharArray();
        Array.Reverse(symbols);
        return new string(symbols);
    }
}