#include<bits/stdc++.h>
using namespace std;
#define int long long 
const int NN=998244353;
int ans=1;
char a[1010][1010];
int f[100100][2],n;
signed main(){
	cin>>n;
	for (int i=1;i<=n;i++)
	for (int j=1;j<=n;j++)
	cin>>a[i][j];
	for (int i=1;i<=n;i++){
		f[0][0]=1;
		for (int j=1;j<=n;j++)
		if(a[i][j]=='.')f[j][0]=(f[j-1][0]+f[j-1][1])%NN,f[j][1]=0;
		else if(a[i][j]=='#')f[j][1]=f[j-1][0]+(a[i][j-1]=='#'?f[j-1][1]:0),f[j][0]=0;
		else f[j][0]=f[j-1][0],f[j][1]=(f[j-1][0]+f[j-1][1])%NN;
		ans=ans*(f[n][0]+f[n][1])%NN;
//		cout<<ans<<"**\n";
	}
	for (int i=1;i<=n;i++){
		f[0][0]=1;
		for (int j=1;j<=n;j++)
		if(a[j][i]=='.')f[j][0]=(f[j-1][0]+f[j-1][1])%NN,f[j][1]=0;
		else if(a[j][i]=='#')f[j][1]=f[j-1][0]+(a[j-1][i]=='#'?f[j-1][1]:0),f[j][0]=0;
		else f[j][0]=f[j-1][0],f[j][1]=(f[j-1][0]+f[j-1][1])%NN;
		ans=ans*(f[n][0]+f[n][1])%NN;
//		cout<<ans<<"^^^\n";
	}
	cout<<ans<<"\n";
}