import scala.io.StdIn.readLine

object Main {
  def main(args: Array[String]): Unit = {
    val Array(n, m) = readLine().split(" ").map(_.toLong)
    val row = readLine().split(" ").map(_.toInt)
    val column = readLine().split(" ").map(_.toInt)
    if (row.fold(0)(_ ^ _) == column.fold(0)(_ ^ _)) {
      println(powMod(1 << 20, (n - 1) * (m - 1)))
    } else {
      println(0)
    }
  }

  val MOD = 998244353;

  def powMod(base : Long, exp : Long): Long = {
    if (exp == 0) 1
    else {
      (if (exp % 2 == 1) base else 1) * powMod(base * base % MOD, exp / 2) % MOD
    }
  }
}