TextBombardment

namespace TextBombardment
{
    using System;
    using System.Linq;
    using System.Text;

    public class TextBombardment
    {
        public static char[,] matrix;

        public static void Main()
        {
            string text = Console.ReadLine();
            double cols = double.Parse(Console.ReadLine());

            int rows = (int)Math.Ceiling(text.Length / cols);

            matrix = new char[rows, (int)cols];
            FillTheMatrix(text);

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

            foreach (int col in colsToBomb)
            {
                BombTheCol(col);
            }

            PrintTheResult(text);
        }

        private static void BombTheCol(int col)
        {
            int row = GetTheStartRow(col);
            while (row != matrix.GetLength(0) && matrix[row, col] != ' ')
            {
                matrix[row, col] = ' ';

                row++;
            }
        }

        private static int GetTheStartRow(int col)
        {
            int rowToReturn = 0;

            while (rowToReturn != matrix.GetLength(0) && matrix[rowToReturn, col] == ' ')
            {
                rowToReturn++;
            }

            return rowToReturn;
        }

        private static void PrintTheResult(string text)
        {
            StringBuilder result = new StringBuilder();
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    result.Append(matrix[row, col]);

                    if (result.Length == text.Length)
                    {
                        goto PrintResult;
                    }
                }
            }

            PrintResult:
            Console.WriteLine(result.ToString());
        }

        private static void FillTheMatrix(string text)
        {
            int indexOfText = -1;
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    char toFill = ++indexOfText < text.Length ? text[indexOfText] : ' ';

                    matrix[row, col] = toFill;
                }
            }
        }
    }
}