module Main where
 
main :: IO ()
main = do
  _ <- getLine
  a <- getIntList
  mapM_ putStrLn $ solve a
 
solve :: [Int] -> [String]
solve a = fmt . dropWhile (==0) . loop $ reverse a
 
loop xs@[x, y, z] = xs
loop (x:y:z:xs)   = loop (y:z+x:xs)
loop xs           = xs
 
fmt :: [Int] -> [String]
fmt [] = ["0", "0"]
fmt ns = map ($ ns) [f1, f2]
  where
  f1 = show . pred . length
  f2 = unwords . reverse . map show
 
getIntList :: IO [Int]
getIntList = map read . words <$> getLine