The next time you see Elvis Presley, take him to the offices of the London newspaper The Sun and collect a $1.78 million reward. The tabloid, all caught up in the Elvis-is-alive mania, hit the streets of London Tuesday with a headline that blared "Bring us Elvis and we'll give you 1 million pounds." But the Elvis will have to be verified through dental records and fingerprints and then he will be required to sing "All Shook Up," "Blue Suede Shoes" and "Hound Dog," the Sun said. "We are offering the magic million because of the huge response to the story in yesterday's Sun that asked, `Is Elvis alive?"' the newspaper said on its front page Tuesday.