What should be the qualifications to be the president of a country?

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Who do you think can be the president of a country? Can it be anyone or there are some qualifications that you consider should be in the president? i feel, that for being the president of such a large country as india, the person must be a renowned person with lot of dignity and knowledge. For the indian mylotters, i would ask is Pratibha Ptil the right choice? Would she be able to handle and fit in the country's highest ceremonial position?