#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
using mint = modint998244353;
const int mod = 998244353;
//const int INF = 1e9;
//const long long LINF = 1e18;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n) - 1; i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r) - 1;i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define P pair<int,int>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int h, w; cin >> h >> w;
	vector<string>s(h);
	rep(i, h)cin >> s[i];
	vector dp1(h, vector<mint>(w));
	vector dp2(h, vector<mint>(w));
	dp1[1][0] = dp2[0][1] = 1;
	rep(i, h)rep(j, w) {
		if (i != h - 1 && s[i + 1][j] != '#') {
			dp1[i + 1][j] += dp1[i][j];
			dp2[i + 1][j] += dp2[i][j];
		}
		if (j != w - 1 && s[i][j + 1] != '#') {
			dp1[i][j + 1] += dp1[i][j];
			dp2[i][j + 1] += dp2[i][j];
		}
	}
	mint ans = dp1[h - 1][w - 2] * dp2[h - 2][w - 1];
	ans -= dp1[h - 2][w - 1] * dp2[h - 1][w - 2];
	cout << ans.val() << endl;
	return 0;
}