Panda Scotland Flag

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


class PandaScotlandFlag
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());

        //char[] letters = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J'}

        // 65-90

        int currentLetter = 65;

        for (int i = 0; i < N/2; i++)
        {
            if (currentLetter == 91)
            {
                currentLetter = 65;
            }

            char ch1 = (char)currentLetter;
            char ch2 = (char)(currentLetter + 1);

            if (currentLetter + 1 == 91)
            {
                ch2 = (char)65;
                currentLetter = 64;
            }

            currentLetter += 2;

            Console.WriteLine("{0}{1}{2}{3}{0}", new string('~', i), ch1, new string('#', N - 2 - 2*i), ch2);
        }

        Console.WriteLine("{0}{1}{0}", new string('-', N/2), (char)currentLetter);
        currentLetter++;

        for (int i = 0; i < N/2; i++)
        {
           if (currentLetter == 91)
            {
                currentLetter = 65;
            }

            char ch1 = (char)currentLetter;
            char ch2 = (char)(currentLetter + 1);

            if (currentLetter + 1 == 91)
            {
                ch2 = (char)65;
                currentLetter = 64;
            }

            currentLetter += 2;

            Console.WriteLine("{0}{1}{2}{3}{0}", new string('~', (N - 3 - 2*i)/2), ch1, new string('#', 2*i + 1), ch2);
        }
    }
}