LIMA (AFP) - Former army officer Ollanta Humala was sworn in Thursday as president of Peru aiming to confront the high poverty plaguing his Andean nation despite its solid economic growth. Humala became Peru's first leftist president in almost four decades in a ceremony in Congress attended by a dozen Latin American heads of state and delegations from more than 100 countries. The successor to center-right leader Alan Garcia promised "to fight for social integration, particularly of the poorest," before taking on the presidential sash.