Given the task definition and input, reply with output. You are given a passage. Using the information present in the passage, you need to classify it into one of the 10 topics: 0 - 'Society & Culture', 1 - 'Science & Mathematics', 2 - 'Health', 3 - 'Education & Reference', 4 - 'Computers & Internet', 5 - 'Sports', 6 - 'Business & Finance', 7 - 'Entertainment & Music', 8 - 'Family & Relationships', 9 - 'Politics & Government'.

World Rulers: Heads of State and Prime Ministers -\nOn this pages you will find all Heads of State and Chiefs of Government of the countries of the world\nhttp://www.info-regenten.de/regent/regent-e/\n\nThis site contains lists of heads of state and heads of government (and, in certain cases, de facto leaders not occupying either of those formal positions) of all countries and territories, going back to about 1700 in most cases\nhttp://rulers.org/

9