#include<bits/stdc++.h>
#include<atcoder/modint>
using namespace std;
using mint = atcoder::modint998244353;

int main(){
    int h, w, k; cin >> h >> w >> k;
    vector<string> a(h);
    for (int i = 0; i < h; i++) cin >> a[i];
    vector dp(h+1,vector(w+1,vector<mint>(k+1,0)));
    dp[0][0][0] = 1;
    for (int x = 0; x < h; x++) for (int y = 0; y < w; y++) for (int i = 0; i < k; i++){
        if (x != h-1 && a[x+1][y] != '#'){
            int j = i + (a[x+1][y] == 'o' ? 1 : 0);
            dp[x+1][y][j] += dp[x][y][i];
        }
        if (y != w-1 && a[x][y+1] != '#'){
            int j = i + (a[x][y+1] == 'o' ? 1 : 0);
            dp[x][y+1][j] += dp[x][y][i];
        }
    }
    mint ans = 0;
    for (int i = 0; i < k; i++){
        ans += dp[h-1][w-1][i];
    }
    cout << ans.val() << endl;
}