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

int dx[2] = {1, 0};
int dy[2] = {0, 1};

int main() {
	int H, W, K;
	cin >> H >> W >> K;
	vector<string> S(H);
	for (int i = 0; i < H; i++){
		cin >> S[i];
	}
	vector<vector<vector<mint>>> dp(H, vector<vector<mint>>(W, vector<mint>(K + 1)));
	dp[0][0][K] = 1;
	for (int i = 0; i < H; i++){
		for (int j = 0; j < H; j++){
			for (int k = 0; k <= K; k++){
				for (int l = 0; l < 2; l++){
					int px = i + dx[l], py = j + dy[l];
					if (0 <= px and px < H and 0 <= py and py < W and S[px][py] != '#'){
						if (S[px][py] == '.'){
							dp[px][py][k] += dp[i][j][k];
						} else {
							if (k > 1){
								dp[px][py][k - 1] += dp[i][j][k];
							}
						}
					}
				}
			}
		}
	}
	mint ans = 0;
	for (int i = 1; i <= K; i++){
		ans += dp[H - 1][W - 1][i];
	}
	cout << ans.val() << '\n';
}