#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
template<typename T> inline bool chmax(T &a, T b) { return ((a < b) ? (a = b, true) : (false)); }
template<typename T> inline bool chmin(T &a, T b) { return ((a > b) ? (a = b, true) : (false)); }
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
#define rep2(i, m ,n) for (int i = (m); i < (long long)(n); i++)
#define REP(i, n) for (long long i = 1; i < (long long)(n); i++)
typedef long long ll;
#define updiv(N,X) (N + X - 1) / X
#define l(n) n.begin(),n.end()
#define YesNo(Q) Q==1?cout<<"Yes":cout<<"No"
using P = pair<int, int>;
using mint = modint;
const int MOD = 998244353LL;
const ll INF = 999999999999LL;
vector<long long> fact, fact_inv, inv;
/*  init_nCk :二項係数のための前処理
    計算量:O(n)
*/
template <typename T>
void input(vector<T> &v){
 rep(i,v.size()){cin>>v[i];}
  return;
}
void init_nCk(int SIZE) {
    fact.resize(SIZE + 5);
    fact_inv.resize(SIZE + 5);
    inv.resize(SIZE + 5);
    fact[0] = fact[1] = 1;
    fact_inv[0] = fact_inv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < SIZE + 5; i++) {
        fact[i] = fact[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
        fact_inv[i] = fact_inv[i - 1] * inv[i] % MOD;
    }
}
/*  nCk :MODでの二項係数を求める(前処理 int_nCk が必要)
    計算量:O(1)
*/
long long nCk(int n, int k) {
    assert(!(n < k));
    assert(!(n < 0 || k < 0));
    return fact[n] * (fact_inv[k] * fact_inv[n - k] % MOD) % MOD;
}

long long modpow(long long a, long long n, long long mod) {
    long long res = 1;
    while (n > 0) {
        if (n & 1) res = res * a % mod;
        a = a * a % mod;
        n >>= 1;
    }
    return res;
}

ll POW(ll a,ll n){
  long long res = 1;
    while (n > 0) {
        if (n & 1) res = res * a;
        a = a * a;
        n >>= 1;
    }
    return res;
}
int main() {
 int h,w;cin>>h>>w;
 vector<string> v(h);
 ll cnt = 0;ll cnt2 = 0;
 rep(i,h){cin>>v[i];
 	rep(j,w){if(v[i][j]=='#'){cnt++;}}
 }
 dsu d(h*w);
 rep(i,h){
 	rep(j,w){
 		if((i==0||i==h-1)&&v[i][j]=='#'){cnt2++;}
 		if((j==0||j==w-1)&&v[i][j]=='#'){cnt2++;}
 	}
 }
 rep(i,h){rep(j,w-1){if(!(v[i][j]=='.'&&v[i][j+1]=='.')){cnt2++;}
 	if(v[i][j]=='#'&&v[i][j+1]=='#'){d.merge(i*w+j,i*w+j+1);}
 }}
 rep(i,h-1){rep(j,w){if(!(v[i][j]=='.'&&v[i+1][j]=='.')){cnt2++;}
 	if(v[i][j]=='#'&&v[i+1][j]=='#'){d.merge(i*w+j,i*w+j+w);}
 }}
 set<ll> st;
 rep(i,h){
 	rep(j,w){
 		if(v[i][j]=='#'){
 			st.insert(d.leader(i*w+j));
 		}
 	}
 }
 ll cnt3 = st.size();
 //cout<<cnt2-cnt-cnt3<<endl;
 cout << modpow(2LL,cnt2-cnt-cnt3,998244353LL) << endl;
}