#pragma GCC optimize("Ofast")
#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
#include <deque>
#include <stack>
#include <sstream>
#include <utility>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
#include <tuple>
#include <array>
#include <bitset>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}
inline ll time() {
    return static_cast<long double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()) * 1e-9;
}

constexpr ll mod = 998244353;

ll mod_pow(ll a,ll b){
    a%=mod;
    if(b==0)return 1;
    if(b==1)return a;
    ll res=mod_pow(a,b/2)%mod;
    res*=res; res%=mod;
    if(b%2)res*=a;
    return res%mod;
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ll n,m; cin >> n >> m;
    vector<int> a(n),b(m);
    int g = 0, gg = 0;
    for(int i=0;i<n;i++){
        cin >> a[i];
        g ^= a[i];
    }
    for(int i=0;i<m;i++){
        cin >> b[i];
        gg ^= b[i];
    }
    if(g != gg){
        cout << 0 << endl;
        return 0;
    }
    cout << mod_pow(mod_pow(2,(n-1)*(m-1)),20) << endl;
}