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

#include <atcoder/modint>
using mint = atcoder::modint998244353;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int H, W;
    cin >> H >> W;
    vector<string> S(H);
    for (int i = 0; i < H; i++) cin >> S[i];
    vector<vector<mint>> P(2, vector<mint>(2));
    vector<pair<int, int>> A = {{1, 0}, {0, 1}};
    vector<pair<int, int>> B = {{H - 1, W - 2}, {H - 2, W - 1}};
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 2; j++) {
            auto [sr, sc] = A[i];
            auto [tr, tc] = B[j];
            vector<vector<mint>> dp(H, vector<mint>(W));
            dp[sr][sc] = 1;
            for (int r = 0; r < H; r++) {
                for (int c = 0; c < W; c++) {
                    if (S[r][c] == '.') {
                        if (r) dp[r][c] += dp[r - 1][c];
                        if (c) dp[r][c] += dp[r][c - 1];
                    }
                }
            }
            P[i][j] = dp[tr][tc];
        }
    }
    cout << (P[0][0] * P[1][1] - P[0][1] * P[1][0]).val() << endl;
}