#include <bits/stdc++.h>
using namespace std;

long long mod = 998244353;
//入力が必ずmod未満の時に使う.
struct mint{
    long long v = 0;
    mint(){} mint(int a){v = a;} mint(long long a){v = a;} mint(unsigned long long a){v = a;}
    long long val(){return v;}
    void modu(){v %= mod;}
 
    mint repeat2mint(const long long a,long long b){
        mint ret = 1,p = a;
        while(b){
            if(b&1) ret *= p;
            p *= p; b >>= 1;
        }
        return ret;
    };
 
    mint operator+(const mint b){return mint(v)+=b;}
    mint operator-(const mint b){return mint(v)-=b;}
    mint operator*(const mint b){return mint(v)*=b;}
    mint operator/(const mint b){return mint(v)/=b;}
 
    mint operator+=(const mint b){
        v += b.v; if(v >= mod) v -= mod;
        return *this;
    }
    mint operator-=(const mint b){
        v -= b.v; if(v < 0) v += mod; 
        return *this;
    }   
    mint operator*=(const mint b){v = v*b.v%mod; return *this;}
    mint operator/=(mint b){
        if(b == 0) assert(false);
        int left = mod-2;
        while(left){if(left&1) *this *= b; b *= b; left >>= 1;}
        return *this;
    }
 
    mint operator++(int){*this += 1; return *this;}
    mint operator--(int){*this -= 1; return *this;}
    bool operator==(const mint b){return v == b.v;}
    bool operator!=(const mint b){return v != b.v;}
    bool operator>(const mint b){return v > b.v;}
    bool operator>=(const mint b){return v >= b.v;}
    bool operator<(const mint b){return v < b.v;}
    bool operator<=(const mint b){return v <= b.v;}
    
    mint pow(const long long x){return repeat2mint(v,x);}
    mint inv(){return mint(1)/v;}
};

class UnionFind{
    public:
    vector<int> par,siz;
 
    void make(int N){
        par.resize(N,-1);
        siz.resize(N,1);
    }
 
    int root(int x){
        if(par.at(x) == -1) return x;
        else return par.at(x) = root(par.at(x));
    }
 
    void unite(int u, int v){
        u = root(u),v = root(v);
        if(u == v) return;
        if(siz.at(u) < siz.at(v)) swap(u,v);
 
        par.at(v) = u;
        siz.at(u) += siz.at(v);
    }
 
    bool issame(int u, int v){
        if(root(u) == root(v)) return true;
        else return false;
    }
};

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,M; cin >> N >> M;
    vector<string> S(N);
    for(auto &s : S) cin >> s;

    UnionFind Z; Z.make(N*M);

    mint answer = 1;
    for(int i=0; i<N; i++) for(int k=0; k<M; k++){
        if(S.at(i).at(k) == '#'){
            int pos = i*M+k;
            if(i == 0 || k == 0 || !Z.issame(pos-1,pos-M)) answer *= 4; 
            else answer *= 2;
            if(i && S.at(i-1).at(k) == '#') Z.unite(pos-M,pos);
            if(k && S.at(i).at(k-1) == '#') Z.unite(pos-1,pos); 
        }
    }
    cout << answer.v << endl;
}