#include <bits/stdc++.h>
using namespace std;

int main() {
  int H, W, K, Ans = 0, m = 998244353; cin >> H >> W >> K;
  vector<string> S(H); for (string &s : S) cin >> s;
  vector DP(H, vector<vector<int>>(W, vector<int>(K + 1)));
  DP[0][0][K] = 1;

  for (int i = 0; i < H; i++) {
    for (int j = 0; j < W; j++) {
      for (int k = 1; k <= K; k++) {
        if (j != W - 1 && S[i][j + 1] == '.') DP[i][j + 1][k] = (DP[i][j + 1][k] + DP[i][j][k]) % m;
        if (i != H - 1 && S[i + 1][j] == '.') DP[i + 1][j][k] = (DP[i + 1][j][k] + DP[i][j][k]) % m;
        if (j != W - 1 && S[i][j + 1] == 'o' && k > 1) DP[i][j + 1][k - 1] = (DP[i][j + 1][k - 1] + DP[i][j][k]) % m;
        if (i != H - 1 && S[i + 1][j] == 'o' && k > 1) DP[i + 1][j][k - 1] = (DP[i + 1][j][k - 1] + DP[i][j][k]) % m;
      }
    }
  }

  for (int i : DP[H - 1][W - 1]) Ans = (Ans + i) % m;
  cout << Ans << endl;
}