#include<bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint=modint998244353; //1000000007;
using ll=long long;
using pp=pair<int,int>;
#define sr string 
#define vc vector
#define fi first
#define se second
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define pque priority_queue
#define bpc(a) __builtin_popcount(a)
int main(){
  ll n,m;cin>>n>>m;
  vc<int>a(n),b(m); rep(i,n)cin>>a[i]; rep(i,m)cin>>b[i];
  int t=0; rep(i,n)t^=a[i]; rep(i,m)t^=b[i];
  if(t){
    cout<<0;
    return 0;
  }
  mint ans=mint(2).pow(20*(ll)(n-1)*(m-1));
  cout<<ans.val();
}