using System;
class DNA
{
    static void Main()
    {
        int lengthDNA = int.Parse(Console.ReadLine());
        string letter = Console.ReadLine();
        int ascIICode = 0;
        switch (letter)
        {
            case "A":
                ascIICode = 65;
                break;
            case "B":
                ascIICode = 66;
                break;
            case "C":
                ascIICode = 67;
                break;
            case "D":
                ascIICode = 68;
                break;
            case "E":

                ascIICode = 69;
                break;
            case "F":
                ascIICode = 70;
                break;
            case "G":
                ascIICode = 71;
                break;
        }

        string point = ".";
        int pointsCount;
        int lettersCount;
        int row;
        int i;

        do
        {
            // upper part
            row = 1;
            pointsCount = 3;
            lettersCount = 1;
            do
            {
                for (i = 0; i < pointsCount; i++)
                {
                    Console.Write(point);
                }
                for (i = 0; i < lettersCount; i++)
                {
                    Console.Write((char)ascIICode);

                    if (ascIICode < 71)
                    {
                        ascIICode++;
                    }
                    else
                    {
                        ascIICode = 65;
                    }
                }
                for (i = 0; i < pointsCount; i++)
                {
                    Console.Write(point);
                }
                // end of row
                lengthDNA--;
                if (lengthDNA == 0)
                {
                    return;
                }
                row++;
                lettersCount += 2;
                pointsCount--;
                Console.WriteLine();

            } while (row <= 4);

            // down part
            pointsCount = 1;
            lettersCount = 5;
            do
            {
                for (i = pointsCount; i > 0; i--)
                {
                    Console.Write(point);
                }
                for (i = lettersCount; i > 0; i--)
                {
                    Console.Write((char)ascIICode);

                    if (ascIICode < 71)
                    {
                        ascIICode++;
                    }
                    else
                    {
                        ascIICode = 65;
                    }
                }
                for (i = pointsCount; i > 0; i--)
                {
                    Console.Write(point);
                }
                //end row
                lengthDNA--;
                if (lengthDNA == 0)
                {
                    return;
                }
                row++;
                lettersCount -= 2;
                pointsCount++;
                Console.WriteLine();

            } while (row <= 7);

        } while (lengthDNA != 0);
    }
}