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


class Task3
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        string letter =Console.ReadLine();
        string letters = "ABCDEFG";

        int let = 0;
        switch (letter)
        {
            case "A": let = 0; break;
            case "B": let = 1; break;
            case "C": let = 2; break;
            case "D": let = 3; break;
            case "E": let = 4; break;
            case "F": let = 5; break;
            case "G": let = 6; break;

        }

        int wholeDNA = n/7;
        for (int i = 0; i <wholeDNA ; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                Console.Write(new string('.', 3 - j));
                for (int k = 0; k < 1+2*j; k++)
                {
                    Console.Write(letters[let]);
                    let++;
                    if (let>6)
                    {
                        let = 0;
                    }
                }
                Console.WriteLine(new string('.', 3 - j));
            }
            for (int j = 2; j >= 0; j--)
            {
                Console.Write(new string('.', 3 - j));
                for (int k = 0; k < 1+2*j; k++)
                {
                    Console.Write(letters[let]);
                    let++;
                    if (let>6)
                    {
                        let = 0;
                    }
                }
                Console.WriteLine(new string('.', 3 - j));
            }
        }
        int partDNA = n % 7;
        if (partDNA<=4)
        {
             for (int j = 0; j < partDNA; j++)
            {
                Console.Write(new string('.', 3 - j));
                for (int k = 0; k < 1+2*j; k++)
                {
                    Console.Write(letters[let]);
                    let++;
                    if (let>6)
                    {
                        let = 0;
                    }
                }
                Console.WriteLine(new string('.', 3 - j));
            }
        }
        else
        {

            for (int j = 0; j < 4; j++)
            {
                Console.Write(new string('.', 3 - j));
                for (int k = 0; k < 1 + 2 * j; k++)
                {
                    Console.Write(letters[let]);
                    let++;
                    if (let > 6)
                    {
                        let = 0;
                    }
                }
                Console.WriteLine(new string('.', 3 - j));
            }
            if (partDNA == 6)
            {
                for (int j = 2; j > 0; j--)
                {
                    Console.Write(new string('.', 3 - j));
                    for (int k = 0; k < 1 + 2 * j; k++)
                    {
                        Console.Write(letters[let]);
                        let++;
                        if (let > 6)
                        {
                            let = 0;
                        }
                    }
                    Console.WriteLine(new string('.', 3 - j ));
                }
            }
            else if (partDNA==5)
            {
                for (int j = 2; j >1; j--)
                {
                    Console.Write(new string('.', 3 - j));
                    for (int k = 0; k < 1 + 2 * j; k++)
                    {
                        Console.Write(letters[let]);
                        let++;
                        if (let > 6)
                        {
                            let = 0;
                        }
                    }
                    Console.WriteLine(new string('.', 3 - j));
                }
            }
            else
            {
                for (int j = 7-partDNA; j >= 0; j--)
                {
                    Console.Write(new string('.', 3 - j));
                    for (int k = 0; k < 1 + 2 * j; k++)
                    {
                        Console.Write(letters[let]);
                        let++;
                        if (let > 6)
                        {
                            let = 0;
                        }
                    }
                    Console.WriteLine(new string('.', 3 - j));
                }
            }

        }
    }
}