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 = {
    var result = 1L
    var b = base % MOD
    var e = exp
    while (e > 0) {
      if ((e & 1) == 1) {
        result = result * b % MOD
      }
      b = b * b % MOD
      e /= 2
    }
    result
  }
}