#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001


int main(){
	
	int h,w,K;
	cin>>h>>w>>K;
	vector<string> s(h);
	rep(i,h)cin>>s[i];
	
	vector dp(h,vector(w,vector<mint>(K)));
	dp[0][0][0] = 1;
	rep(i,h){
		rep(j,w){
			rep(k,K){
				if(i+1!=h){
					int ni = i+1,nj = j,nk = k;
					if(s[ni][nj]!='#'){
						if(s[ni][nj]=='o')nk++;
						if(nk<K){
							dp[ni][nj][nk] += dp[i][j][k];
						}
					}
				}
				if(j+1!=w){
					int ni = i,nj = j+1,nk = k;
					if(s[ni][nj]!='#'){
						if(s[ni][nj]=='o')nk++;
						if(nk<K){
							dp[ni][nj][nk] += dp[i][j][k];
						}
					}
				}
				
			}
		}
	}
	mint ans = 0;
	rep(i,K)ans += dp[h-1][w-1][i];
	cout<<ans.val()<<endl;
		
	return 0;
}