#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//const long nPrime = 1000000007;
const long nPrime = 998244353;
typedef long long ll;

long LF_Pow(long nBase, long nExp){
    if(nExp < 0){
        return -1;
    }
    long iTmp = nBase % nPrime;
    long nReturn = 1;
    while (nExp > 0){
        if(nExp % 2 == 1){
            nReturn *= iTmp;
            nReturn %= nPrime;
        }
        iTmp = iTmp * iTmp;  
        iTmp %= nPrime;
        nExp /= 2;
    }
    return nReturn;    
}
int main() {
    ll n,m;
    cin >> n >> m;
    ll nSum=0;
    for(ll i = 0; i < n; i++){
        ll x;
        cin >> x;
        nSum ^= x;
    }
    for(ll i = 0; i < m; i++){
        ll x;
        cin >> x;
        nSum ^= x;
    }
    
    if(nSum != 0){
        cout << 0 << endl;
        return 0;
    }
    
    cout << LF_Pow(2, 20*(n-1)*(m-1)) <<endl;
    return 0;
}