using System;

​

public class Program

{

    public void Main()

    {

        printy(7); //input here plz

    }

​

    public void printy(int y)

    {

        for (int i = 0; i < y; i++)

        {

            string l = "";

            for (int j = 0; j < y; j++)

            {

                if (j == 0 || j == y - 1)

                {

                    l += "X ";

                }

                else if (j == i)

                {

                    l += "X ";

                }

                else

                {

                    l += "O ";

                }

            } //for j loop

​

            Console.WriteLine(l);

        } //for i loop

    } // print y

}