import java.util.Random;

public class Roll20
{
    public static void main(String[] args)
    {
        int[] success=new int[Integer.parseInt(System.getenv("COLUMNS"))];
        int max=Integer.parseInt(System.getenv("LINES"))-1;

        Random rand=new Random();
        boolean donezo=false;
        while (!donezo)
        {
            int roll=0;
            while (rand.nextInt(20)!=0) roll++;

            if (roll<success.length)
            {
                success[roll]++;
                if (success[roll]==max) donezo=true;
            }
        }

        for (int row=max; row>0; row--)
            for (int x=0; x<success.length; x++)
                System.out.print(row<=success[x]?"X":" ");
    }
}