03. Panda Scotland Flag

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        string alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        int alphabetCount = 0;
        int outerCount = 1;
        int flagCount = n - 2;

        for (int i = 0; i < n; i++)
        {
            if (n == 1)
            {
                Console.WriteLine("A");
                break;
            }
            if (i == 0)
            {
                Console.Write(alphabet[alphabetCount]);
                alphabetCount++;
                if (alphabetCount > 25)
                {
                    alphabetCount = 0;
                }
                string flag = new string('#', flagCount);
                Console.Write(flag);
                Console.WriteLine(alphabet[alphabetCount]);
                alphabetCount++;
                if (alphabetCount > 25)
                {
                    alphabetCount = 0;
                }
                flagCount -= 2;
            }
            else if (i >= 1 && i <= n / 2 - 1)
            {
                string outerFlag = new string('~', outerCount);
                Console.Write(outerFlag);
                Console.Write(alphabet[alphabetCount]);
                alphabetCount++;
                if (alphabetCount > 25)
                {
                    alphabetCount = 0;
                }
                string flag = new string('#', flagCount);
                Console.Write(flag);
                Console.Write(alphabet[alphabetCount]);
                alphabetCount++;
                if (alphabetCount > 25)
                {
                    alphabetCount = 0;
                }
                Console.WriteLine(outerFlag);
                flagCount -= 2;
                outerCount++;
            }
            else if (i == n / 2)
            {
                string dashes = new string('-', (n - 1) / 2);
                Console.Write(dashes);
                Console.Write(alphabet[alphabetCount]);
                alphabetCount++;
                if (alphabetCount > 25)
                {
                    alphabetCount = 0;
                }
                Console.WriteLine(dashes);
                flagCount += 2;
                outerCount--;
            }
            else if (i > n / 2 && i < n - 1)
            {
                string outerFlag = new string('~', outerCount);
                Console.Write(outerFlag);
                Console.Write(alphabet[alphabetCount]);
                alphabetCount++;
                if (alphabetCount > 25)
                {
                    alphabetCount = 0;
                }
                string flag = new string('#', flagCount);
                Console.Write(flag);
                Console.Write(alphabet[alphabetCount]);
                alphabetCount++;
                if (alphabetCount > 25)
                {
                    alphabetCount = 0;
                }
                Console.WriteLine(outerFlag);
                outerCount--;
                flagCount += 2;
            }
            else if (i == n - 1)
            {
                Console.Write(alphabet[alphabetCount]);
                alphabetCount++;
                if (alphabetCount > 25)
                {
                    alphabetCount = 0;
                }
                string flag = new string('#', flagCount);
                Console.Write(flag);
                Console.WriteLine(alphabet[alphabetCount]);
            }
        }
    }
}