#include"bits/stdc++.h"
#include"atcoder/all"
using namespace std;
using mint = atcoder::modint998244353;

int main(){
	int H,W;
	cin >> H >> W;
	vector<string> S(H);
	for(int i = 0; i < H; i++) cin >> S[i];
	
	int N = H+W-2;
	vector<vector<mint>> dp(W,vector<mint>(W,0));
	dp[1][0] = 1;
	
	for(int i = 1; i < N; i++){
		vector<vector<mint>> ndp(W,vector<mint>(W,0));
		for(int a = 0; a < W; a++)
			for(int b = 0; b < W; b++){
				int xa = i-a, xb = i-b;
				
				if(xa < 0 || xa >= H || xb < 0 || xb >= H) continue;
				
				if(xa+1 < H && S[xa+1][a] == '.'){
					if(xb+1 < H && S[xb+1][b] == '.' && (i+1 == N || xb+1 != xa+1))
						ndp[a][b] += dp[a][b];
					if(b+1 < W && S[xb][b+1] == '.' && (i+1 == N || xb != xa+1))
						ndp[a][b+1] += dp[a][b];
				}
				
				if(a+1 < W && S[xa][a+1] == '.'){
					if(xb+1 < H && S[xb+1][b] == '.' && (i+1 == N || xb+1 != xa))
						ndp[a+1][b] += dp[a][b];
					if(b+1 < W && S[xb][b+1] == '.' && (i+1 == N || xb != xa))
						ndp[a+1][b+1] += dp[a][b];
				}
			}
		dp = ndp;
	}
	cout << dp[W-1][W-1].val() << endl;
}