#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#include <atcoder/all>


using namespace std;
using namespace atcoder;
#define rep(i,m,n,k) for (int i = (int)(m); i < (int)(n); i += (int)(k))
#define rrep(i,m,n,k) for (int i = (int)(m); i > (int)(n); i += (int)(k))
#define ll long long
#define list(T,A,N) vector<T> A(N);for(int i=0;i<(int)(N);i++){cin >> A[i];}
template<typename T> bool chmin(T& a, T b){if(a > b){a = b; return true;} return false;}
template<typename T> bool chmax(T& a, T b){if(a < b){a = b; return true;} return false;}
using modint = modint998244353;
int main(){
    ll N,M;
    cin >> N >> M;
    list(ll,A,N);
    list(ll,B,M);
    ll ta=0;
    ll tb=0;
    for(auto a:A){
        ta ^= a;
    }
    for(auto b:B){
        tb ^= b;
    }
    if (ta!=tb){
        cout << 0 << endl;
        return 0;
    }
    ll L = 20*(N-1)*(M-1);
    ll ans = 1;
    ans = pow_mod(2,L,998244353);
    cout << ans << endl;
    return 0;

}