/******************************************************************************

Welcome to GDB Online.
GDB online is an online compiler and debugger tool for C, C++, Python, Java, PHP, Ruby, Perl,
Swift, Pascal, Fortran, Haskell, Objective-C, Assembly, HTML, CSS, JS, SQLite, Prolog.
Code, Compile, Run and Debug online from anywhere in world.

*******************************************************************************/
#include <stdio.h>
#include <unistd.h>

void rush(int x, int y)
{
    int i;
    int j;

    j = 0;
    while (j < y)
    {
        i = 0;
        while (i < x)
        {
            if(!((j == 0) || (j == y-1))) // if not first and last line
            {
                if (!((i == 0) || (i == x - 1))) // if not first and last column
                {
                    write (1, " ", 1); //empty space
                    i++;
                }
                else // first and last column
                {
                    write (1, "B", 1);
                    i++;
                }
            }
            else if (j == 0) //first and last line
            {
                if (!((i == 0) || (i == x - 1))) //if not first and last column
                    write (1, "B", 1);
                else
                    write (1, "A", 1);
                i++;
            }
            else
            {
                if (!((i == 0) || (i == x - 1))) //if not first and last column
                    write (1, "B", 1);
                else
                    write (1, "C", 1);
                i++;
            }
        }
        write (1, "\n", 1);
        j++;
    }
}

int main()
{
    rush(8,8);
    return 0;
}