#include <atcoder/all>
#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace atcoder;
using namespace std;
using mint = modint998244353;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int H, W, K;
    cin >> H >> W >> K;
    vector<string> S(H);
    rep(i, H) cin >> S[i];

    vector dist(H, vector(W, vector<mint>(K)));
    dist[0][0][0] = 1;

    rep(k, K) rep(i, H) rep(j, W) {
        if (i + 1 < H) {
            if (S[i + 1][j] == '.')
                dist[i + 1][j][k] += dist[i][j][k];
            else if (S[i + 1][j] == 'o' && k + 1 < K)
                dist[i + 1][j][k + 1] += dist[i][j][k];
        }
        if (j + 1 < W) {
            if (S[i][j + 1] == '.')
                dist[i][j + 1][k] += dist[i][j][k];
            else if (S[i][j + 1] == 'o' && k + 1 < K)
                dist[i][j + 1][k + 1] += dist[i][j][k];
        }
    }

    mint ans = 0;
    rep(k, K) ans += dist[H - 1][W - 1][k];
    cout << ans.val() << "\n";

    return 0;
}