fun readInt () =
    valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn)


fun readStr () =
    let
        fun scan reader stream = SOME (StringCvt.splitl (not o Char.isSpace) reader (StringCvt.skipWS reader stream))
    in
        valOf (TextIO.scanStream scan TextIO.stdIn)
    end


exception BadInput

fun findAns s1 s2 =
    let
        fun findAnsAux _ nil _ = raise BadInput
          | findAnsAux _ _ nil = raise BadInput 
          | findAnsAux index (h1 :: tl1) (h2 :: tl2) =
            if h1 = h2 then findAnsAux (index + 1) tl1 tl2
            else (Int.toString index ^ "\n" ^ h1 ^ "\n" ^ h2 ^ "\n")
    in
        findAnsAux 1 s1 s2
    end


val () =
    let
        val n = readInt ()
        val ss = List.tabulate (n, fn _ => readStr ())
        val ts = List.tabulate (n, fn _ => readStr ())
                        
        val ans = findAns ss ts
    in
        print ans
    end