import sys

# GIF file header
header = b'GIF87a'

# Logical screen descriptor
width = 200
height = 200
background_color_index = 0
aspect_ratio = 0
logical_screen_descriptor = width.to_bytes(2, byteorder='little') + height.to_bytes(2, byteorder='little') + (0x80 | (background_color_index << 2)).to_bytes(1, byteorder='little') + aspect_ratio.to_bytes(1, byteorder='little')

# Global color table
color_table = b'\xFF\xFF\xFF'  # White
color_table += b'\xFF\x00\x00'  # Red

# Image descriptor
image_descriptor = b'\x2C'  # Separator
image_descriptor += (0).to_bytes(2, byteorder='little') + (0).to_bytes(2, byteorder='little')  # Left and top positions
image_descriptor += width.to_bytes(2, byteorder='little') + height.to_bytes(2, byteorder='little')  # Width and height
image_descriptor += b'\x00'  # No local color table, no transparency, no animation

# Image data
image_data = bytearray()
for y in range(height):
    for x in range(width):
        # Draw a red triangle
        if x > height / 2 - y and x < height / 2 + y:
            image_data.append(1)  # Red color index
        else:
            image_data.append(0)  # White color index

# Data sub-blocks
data_sub_blocks = bytearray()
data_sub_blocks.append(0xFF)  # Data sub-block size
data_sub_blocks.extend(image_data)
data_sub_blocks.append(0x00)  # Terminator

# Trailer
trailer = b'\x3B'

# Construct the GIF file
gif_file = header + logical_screen_descriptor + color_table + image_descriptor + data_sub_blocks + trailer

# Write the GIF file to stdout
sys.stdout.buffer.write(gif_file)

python your_soln.py > /tmp/a.gif

import sys

# GIF file header
header = b'GIF87a'

# Logical screen descriptor
width = 200
height = 200
background_color_index = 0
aspect_ratio = 0
logical_screen_descriptor = width.to_bytes(2, byteorder='little') + height.to_bytes(2, byteorder='little') + (0x80 | (background_color_index << 2)).to_bytes(1, byteorder='little') + aspect_ratio.to_bytes(1, byteorder='little')

# Global color table
color_table = b'\xFF\xFF\xFF'  # White
color_table += b'\xFF\x00\x00'  # Red

# Image descriptor
image_descriptor = b'\x2C'  # Separator
image_descriptor += (0).to_bytes(2, byteorder='little') + (0).to_bytes(2, byteorder='little')  # Left and top positions
image_descriptor += width.to_bytes(2, byteorder='little') + height.to_bytes(2, byteorder='little')  # Width and height
image_descriptor += b'\x00'  # No local color table, no transparency, no animation

# Image data
image_data = bytearray()
for y in range(height):
    for x in range(width):
        # Draw a red triangle
        if x > height / 2 - y and x < height / 2 + y:
            image_data.append(1)  # Red color index
        else:
            image_data.append(0)  # White color index

# Data sub-blocks
data_sub_blocks = bytearray()
data_sub_blocks.append(0xFF)  # Data sub-block size
data_sub_blocks.extend(image_data)
data_sub_blocks.append(0x00)  # Terminator

# Trailer
trailer = b'\x3B'

# Construct the GIF file
gif_file = header + logical_screen_descriptor + color_table + image_descriptor + data_sub_blocks + trailer

# Write the GIF file to stdout
def main():
    sys.stdout.buffer.write(gif_file)

if __name__ == "__main__":
    main()

import sys

# GIF file header
header = b'GIF87a'

# Logical screen descriptor
width = 200
height = 200
background_color_index = 0
aspect_ratio = 0
logical_screen_descriptor = width.to_bytes(2, byteorder='little') + height.to_bytes(2, byteorder='little') + (0x80 | (background_color_index << 2)).to_bytes(1, byteorder='little') + aspect_ratio.to_bytes(1, byteorder='little')

# Global color table
color_table = b'\xFF\xFF\xFF'  # White
color_table += b'\xFF\x00\x00'  # Red

# Image descriptor
image_descriptor = b'\x2C'  # Separator
image_descriptor += (0).to_bytes(2, byteorder='little') + (0).to_bytes(2, byteorder='little')  # Left and top positions
image_descriptor += width.to_bytes(2, byteorder='little') + height.to_bytes(2, byteorder='little')  # Width and height
image_descriptor += b'\x00'  # No local color table, no transparency, no animation

# Image data
image_data = bytearray()
for y in range(height):
    for x in range(width):
        # Draw a red triangle
        if x > height / 2 - y and x < height / 2 + y:
            image_data.append(1)  # Red color index
        else:
            image_data.append(0)  # White color index

# Data sub-blocks
data_sub_blocks = bytearray()
data_sub_blocks.append(0xFF)  # Data sub-block size
data_sub_blocks.extend(image_data)
data_sub_blocks.append(0x00)  # Terminator

# Trailer
trailer = b'\x3B'

# Construct the GIF file
gif_file = header + logical_screen_descriptor + color_table + image_descriptor + data_sub_blocks + trailer

# Write the GIF file to stdout
def main():
    sys.stdout.buffer.write(gif_file)

if __name__ == "__main__":
    main()