-- リジャッジ落ち修正
-- putStrLn -> putStr

-- Try yukicoder
-- author: Leonardone @ NEETSDKASU

main = putStr . unlines . solve . map words . tail . lines =<< getContents

solve [xs, ys] = ans where
    ans = head . dropWhile g $ zipWith3 f xs ys [1..]
    f x y n = [show n, x, y]
    g [_, x, y] = x == y