TxtBombardment

using System;

class TxtBomb
{
    static void Main()
    {
        string text = Console.ReadLine();
        int lineWidth = int.Parse(Console.ReadLine());
        string[] bombsInput = Console.ReadLine().Split();

        double rows = text.Length / (double)lineWidth;
        rows = Math.Ceiling(rows);
        char[,] matrix = new char[(int)rows, lineWidth];

        //fill the matrix
        int counter = 0;
        for (int row = 0; row < (int)rows; row++)
        {
            for (int col = 0; col < lineWidth; col++)
            {
                matrix[row, col] = text[counter];
                counter++;
                if (counter == text.Length)
                {
                    break;
                }
            }
        }

        int[] bombs = new int[bombsInput.Length];
        for (int i = 0; i < bombsInput.Length; i++)
        {
            bombs[i] = int.Parse(bombsInput[i]);
        }

        //bombard
        for (int i = 0; i < bombs.Length; i++)
        {
            int bomb = bombs[i];
            bool damageDone = false; //if the first row is empty, the bomb should continue
            for (int j = 0; j < (int)rows; j++)
            {
                if (matrix[j, bomb] == ' ' && damageDone)
                {
                    break;
                }
                else if (matrix[j, bomb] != ' ')
                {
                    matrix[j, bomb] = ' ';
                    damageDone = true;
                }
            }
        }
        // print
        for (int i = 0; i < (int)rows; i++)
        {
            for (int j = 0; j < lineWidth; j++)
            {
                if (matrix[i, j] == '\0' )
                {
                    continue;
                }
                Console.Write(matrix[i, j]);
            }
        }
    }
}