#!/usr/bin/env python3


import curses
from curses import wrapper


def main(stdscr):
    # Clear screen
    stdscr.clear()

    # This raises ZeroDivisionError when i == 10.
    pad = curses.newpad(100, 100)
    # These loops fill the pad with letters; addch() is
    # explained in the next section
    for y in range(0, 99):
        for x in range(0, 99):
            pad.addch(y,x, ord('a') + (x*x+y*y) % 26)

    # Displays a section of the pad in the middle of the screen.
    # (0,0) : coordinate of upper-left corner of pad area to display.
    # (5,5) : coordinate of upper-left corner of window area to be filled
    #         with pad content.
    # (20, 75) : coordinate of lower-right corner of window area to be
    #          : filled with pad content.
    pad.refresh(0, 0, 5, 5, 20, 75)



wrapper(main)