import os
import sys
import traceback
try:
    from PIL import Image
except ModuleNotFoundError:
    try:
        answer = input('Install a package PIL ? [y/n]: ')
        while True:
            if answer == "y" or answer == "yes":
                break
            if answer == "n" or answer == "no":
                sys.exit(0)
        try:
            import pip
            pip.main(['install', '--user', 'pillow'])
        except ImportError:
            print('Pip don\'t exist. Exiting')
            sys.exit(0)
    except (KeyboardInterrupt, OSError):
        print('\nShutdown requested. Exiting')
        sys.exit(0)


def main():
    try:
        filename = sys.argv[1]
        if not os.path.isfile(filename):
            print('A file not exist')
            sys.exit(0)
        image = Image.open(filename)
        state = True
        for pixel in image.getdata():
            if pixel[0] == pixel[1] == pixel[2]:
                continue
            else:
                state = False
                break
        if not state:
            print('an image is colored')
        else:
            print('a black-white image')
    except KeyboardInterrupt:
        print('\nShutdown requested. Exiting')
        sys.exit(0)
    except Exception:
        traceback.print_exc(file=sys.stdout)
        sys.exit(1)


if __name__ == "__main__":
    if len(sys.argv) != 2:
        prog_name = os.path.basename(__file__)
        print(f'Use: python {prog_name} <image>')
        sys.exit(0)
    main()