using System;

public class Program

{

    public static void Main()

    {

         string firstMember = Console.ReadLine();

        string secondMember = Console.ReadLine();

        int l = int.Parse(Console.ReadLine());

​

        const int shift = 64;

        int first = firstMember[0] - shift;

        int second = secondMember[0] - shift;

​

        int spaceBetweenMembers = 0;

​

        if (l == 1)

        {

            Console.WriteLine((char)(first + shift));

            return;

        }

​

        Console.WriteLine((char)(first + shift));

        int next = first + second;

        if (next > 26)

        {

            next = next % 26;

        }

        spaceBetweenMembers++;

        Console.Write("{0}{1}", (char)(second + shift), (char)(next + shift));

        first = second;

        second = next;

        next = first + second;

        if (next > 26 )

        {

            next = next % 26;

        }

​

        Console.WriteLine();

        for (int i = 3; i <= l; i++)

        {

            Console.Write((char)(next + shift));

            Console.Write(new string(' ', spaceBetweenMembers));

            first = second;

            second = next;

            next = first + second;

            if (next > 26)

            {

                next = next % 26;

            }

​

            Console.Write((char)(next + shift));

            first = second;

            second = next;

            next = first + second;

            if (next > 26)

            {

                next = next % 26;

            }

            spaceBetweenMembers++;

            Console.WriteLine();

        }

    }

}