def fullRGB(rgb: int) -> str:
    """Left pad 0's to make the string of length 9."""
    return str(rgb).zfill(9)


def isGray(rgb: int) -> bool:
    """Return True if the RGB value passed is considered 'gray'."""
    rgbStr = fullRGB(rgb)
    return (rgbStr[0:3] == rgbStr[3:6]) and (rgbStr[3:6] == rgbStr[6:9])


print("Testing isGray()...", end="")
assert isGray(112112112) == True
assert isGray(112112113) == False
assert isGray(123195060) == False
assert isGray(255255255) == True
assert isGray(0) == True
assert isGray(19019019) == True
assert isGray(175112) == False
print("Passed!")