#include <iostream>
#include <cassert>
#include <vector>
using namespace std;

struct UnionFind
{
public:
    UnionFind(int n) : n(n), par(n), sz(n, 1), num_of_components(n)
    {
        for (int i = 0; i < n; i++)
        {
            par[i] = i;
        }
    }

    int find(int i)
    {
        assert(0 <= i && i < n);
        return (i == par[i]) ? i : par[i] = find(par[i]);
    }

    bool same(int i, int j)
    {
        assert(0 <= i && i < n);
        assert(0 <= j && j < n);
        return find(i) == find(j);
    }

    void unite(int i, int j)
    {
        assert(0 <= i && i < n);
        assert(0 <= j && j < n);
        i = find(i), j = find(j);
        if (i == j)
        {
            return;
        }
        if (sz[i] < sz[j])
        {
            std::swap(i, j);
        }
        par[j] = i;
        sz[i] += sz[j];
        num_of_components--;
    }

    int size()
    {
        return n;
    }

    int size(int i)
    {
        assert(0 <= i && i < n);
        return sz[find(i)];
    }

    int count()
    {
        return num_of_components;
    }

    bool is_root(int i)
    {
        assert(0 <= i && i < n);
        return i == find(i);
    }

    int operator[](int i)
    {
        return find(i);
    }

private:
    int n;
    std::vector<int> par;
    std::vector<int> sz;
    int num_of_components;
};

template <int MOD>
struct StaticModint
{
    using mint = StaticModint;

public:
    int val;

    StaticModint() : val(0) {}

    StaticModint(long long v)
    {
        if (std::abs(v) >= mod())
        {
            v %= mod();
        }
        if (v < 0)
        {
            v += mod();
        }
        val = v;
    }

    mint &operator++()
    {
        val++;
        if (val == mod())
        {
            val = 0;
        }
        return *this;
    }

    mint &operator--()
    {
        if (val == 0)
        {
            val = mod();
        }
        val--;
        return *this;
    }

    mint &operator+=(const mint &x)
    {
        val += x.val;
        if (val >= mod())
        {
            val -= mod();
        }
        return *this;
    }

    mint &operator-=(const mint &x)
    {
        val -= x.val;
        if (val < 0)
        {
            val += mod();
        }
        return *this;
    }

    mint &operator*=(const mint &x)
    {
        val = (int)((long long)val * x.val % mod());
        return *this;
    }

    mint &operator/=(const mint &x)
    {
        *this *= x.inv();
        return *this;
    }

    mint operator-()
    {
        return mint() - *this;
    }

    mint pow(long long n) const
    {
        mint x = 1, r = *this;
        while (n)
        {
            if (n & 1)
            {
                x *= r;
            }
            r *= r;
            n >>= 1;
        }
        return x;
    }

    mint inv() const
    {
        return pow(mod() - 2);
    }

    friend mint operator+(const mint &x, const mint &y)
    {
        return mint(x) += y;
    }

    friend mint operator-(const mint &x, const mint &y)
    {
        return mint(x) -= y;
    }

    friend mint operator*(const mint &x, const mint &y)
    {
        return mint(x) *= y;
    }

    friend mint operator/(const mint &x, const mint &y)
    {
        return mint(x) /= y;
    }

    friend bool operator==(const mint &x, const mint &y)
    {
        return x.val == y.val;
    }

    friend bool operator!=(const mint &x, const mint &y)
    {
        return x.val != y.val;
    }

    friend std::ostream &operator<<(std::ostream &os, const mint &x)
    {
        return os << x.val;
    }

    friend std::istream &operator>>(std::istream &is, mint &x)
    {
        long long v;
        is >> v;
        x = mint(v);
        return is;
    }

private:
    static constexpr int mod()
    {
        return MOD;
    }
};

using mint = StaticModint<998244353>;

int main()
{
    int n, m;
    cin >> n >> m;
    string s[505];
    for (int i = 0; i < n; i++)
    {
        cin >> s[i];
    }
    mint ans = 1;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
        {
            if (s[i][j] == '#')
            {
                ans *= 4;
            }
        }
    }
    UnionFind uf(n * m);
    for (int i = 0; i < n; i++)
    {
        for(int j = 0; j < m - 1; j++)
        {
            if(s[i][j] == '#' && s[i][j + 1] == '#')
            {
                uf.unite(i * m + j, i * m + j + 1);
            }
        }
    }
    for(int j = 0; j < m; j++)
    {
        for(int i = 0; i < n - 1; i++)
        {
            if(s[i][j] == '#' && s[i + 1][j] == '#')
            {
                if(uf.same(i * m + j, (i + 1) * m + j))
                {
                    ans /= 2;
                }
                uf.unite(i * m + j, (i + 1) * m + j);
            }
        }
    }
    cout << ans << endl;
}