#include <bits/stdc++.h>
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif
using namespace std;

// #include "boost/multiprecision/cpp_int.hpp"
// using namespace boost::multiprecision;

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")

#define ll long long
#define rep(i, n) for (ll i = 0; i < n; ++i)
#define rep_up(i, a, n) for (ll i = a; i < n; ++i)
#define rep_down(i, a, n) for (ll i = a; i >= n; --i)
#define P pair<ll, ll>
#define pb push_back
#define bit_count(x) __builtin_popcountll(x)
#define gcd(a, b) __gcd(a, b)
#define lcm(a, b) a / gcd(a, b) * b
// #define endl "\n"

#define all(v) v.begin(), v.end()
#define fi first
#define se second
#define vll vector<ll>
#define vvll vector<vll>
#define vvvll vector<vvll>
#define vvvvll vector<vvvll>
#define pqll priority_queue<ll>
#define pqllg priority_queue<ll, vector<ll>, greater<ll>>

template <class T>
inline void vin(vector<T> &v) { rep(i, v.size()) cin >> v.at(i); }
template <class T>
using V = vector<T>;

constexpr ll INF = (1ll << 60);
// constexpr ll mod = 1000000007;
constexpr ll mod = 998244353;

// using mint = atcoder::modint;
// using mint = atcoder::modint998244353;
// using mint = atcoder::modint1000000007;
#define vmint vector<mint>
#define vvmint vector<vmint>
#define vvvmint vector<vvmint>
#define vvvvmint vector<vvvmint>

constexpr double pi = 3.14159265358979323846;

random_device seed_gen;
mt19937 engine(seed_gen());

template <typename T>
inline bool chmax(T &a, T b)
{
    if (a < b)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <typename T>
inline bool chmin(T &a, T b)
{
    if (a > b)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <typename T>
void pt(T val)
{
    cout << val << "\n";
}
template <typename T>
void pt_vll(vector<T> &v)
{
    ll vs = v.size();
    rep(i, vs)
    {
        cout << v[i];

        if (i == vs - 1)
            cout << "\n";
        else
            cout << " ";
    }
}
template <typename T>
void pt_vmint(vector<T> &v)
{
    ll vs = v.size();
    rep(i, vs)
    {
        cout << v[i].val();

        if (i == vs - 1)
            cout << "\n";
        else
            cout << " ";
    }
}
ll mypow(ll a, ll n)
{
    ll ret = 1;
    if (n == 0)
        return 1;
    if (a == 0)
        return 0;
    rep(i, n)
    {
        if (ret > (ll)(9e18 + 10) / a)
            return -1;
        ret *= a;
    }
    return ret;
}
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;
}
long long modinv(long long a, long long m)
{
    long long b = m, u = 1, v = 0;
    while (b)
    {
        long long t = a / b;
        a -= t * b;
        swap(a, b);
        u -= t * v;
        swap(u, v);
    }
    u %= m;
    if (u < 0)
        u += m;
    return u;
}

void solve();
// ここまでテンプレ

struct UnionFind
{
    vector<ll> par;

    UnionFind(ll N) : par(N)
    { // 最初はすべてが根であるとして初期化
        for (ll i = 0; i < N; i++)
            par[i] = i;
    }

    int root(ll x)
    { // データxの木の根を再帰で得る
        if (par[x] == x)
            return x;
        return par[x] = root(par[x]);
    }

    void unite(ll x, ll y)
    { // xとyの木を併合
        ll rx = root(x);
        ll ry = root(y);
        if (rx == ry)
            return; // 同じ木にあるときはそのまま
        par[rx] = ry;
    }

    bool same(ll x, ll y)
    { // 2つのデータx,yが属する木が同じならtrue
        ll rx = root(x);
        ll ry = root(y);
        return rx == ry;
    }
};

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    // cout << fixed << setprecision(16);
    // ll T;
    // cin >> T;
    // rep(ca, T)
    solve();
}

void solve()
{
    ll n, m, k, cnt = 0, sum = 0, ans = 0;
    cin >> n >> m;
    UnionFind uf(n * m);
    V<string> s(n);
    rep(i, n) cin >> s[i];
    ans = 1;
    rep(i, n)
    {
        rep(j, m)
        {
            if (s[i][j] == '.')
                continue;
            if (i == 0 || j == 0 || !uf.same((i - 1) * m + j, i * m + j - 1))
            {
                ans *= 4;
            }
            else
            {
                ans *= 2;
            }
            if (i != 0 && s[i - 1][j] == '#')
            {
                uf.unite(i * m + j, (i - 1) * m + j);
            }
            if (j != 0 && s[i][j - 1] == '#')
            {
                uf.unite(i * m + j, i * m + j - 1);
            }
            ans %= mod;
        }
    }
    pt(ans);
}