. >> valentino deng has invited abraham nial, another lost boy who's just been named the new bishop. >> when we left home in the eighties, many of us died. some were eaten by wild animals, some drowned in the rivers. but god keep some of us alive to be witness of what took place in sudan. >> he and valentino are pushing a message of non-violence. >> we had a goal, that if we can survive and go to school, we need to come back and change life in sudan. alentinoave done it. that's why you people are here. we fought for more than 50 years, but nothing was accomplished through the gun. the things are going to change through education. >> madame [indistinct] from [indistinct]. >> it's no easy task after two decades of war. even the teachers here have little formal education. so valentino has appealed for teachers from the other side of the world to help teach them. >> where are you from? >> from new york. >> where in new york? >> uh, manhattan. >> they're among dozens who paid their own way to come as volunteers. >> where in california? >> san francisco. >> despite giving up his retirement