#include <bits/stdc++.h>
#include<atcoder/all>
using namespace atcoder;
using namespace std;
using ll= long long;
ll mod=998244353;
int main(){
    ll n,m;
    cin >> n >> m;
    vector<ll>a(n),b(m);
    ll x=0;
    for (ll i = 0; i < n; i++)
    {
        cin >> a[i];
        x^=a[i];
    }
    for (ll i = 0; i < m; i++)
    {
        cin >> b[i];
        x^=b[i];
    }
    if (x!=0)
    {
        cout << 0 << endl;
        return 0;
    }
    vector<ll>two(30,1);
    for (ll i = 0; i < 20; i++)
    {
        two[i+1]=two[i]*2;
    }
    ll ans=1;
    for (ll i = 0; i < (n-1)*(m-1)*20; i++)
    {
        ans*=2;
        ans%=mod;
    }
    cout << ans << endl;
}