#include <bits/stdc++.h>
using namespace std::literals::string_literals;
using i64 = std::int_fast64_t;
using std::cerr;
using std::cin;
using std::cout;
using std::endl;

#if defined(DONLINE_JUDGE)
#define NDEBUG
#elif defined(ONLINE_JUDGE)
#define NDEBUG
#endif

template <typename T>
std::vector<T> make_v(size_t a) {
    return std::vector<T>(a);
}
template <typename T, typename... Ts>
auto make_v(size_t a, Ts... ts) {
    return std::vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}

int main() {
    int h, w, k;
    scanf("%d%d%d", &h, &w, &k);
    std::vector<std::string> s(h);
    for (auto& v : s) std::cin >> v;

    const int MOD = 998244353;

    auto dp = make_v<int>(h, w, k + 1);
    for (auto& x : dp)
        for (auto& y : x)
            for (auto& z : y) z = 0;
    dp[0][0][0] = 1;

    for (int y = 0; y < h; ++y) {
        for (int x = 0; x < w; ++x) {
            for (int i = 0; i < k; ++i) {
                if (y + 1 < h and s[y + 1][x] != '#') {
                    const int ni = i + (s[y + 1][x] == 'o');

                    dp[y + 1][x][ni] = (dp[y + 1][x][ni] + dp[y][x][i]) % MOD;
                }
                if (x + 1 < w and s[y][x + 1] != '#') {
                    const int ni = i + (s[y][x + 1] == 'o');

                    dp[y][x + 1][ni] = (dp[y][x + 1][ni] + dp[y][x][i]) % MOD;
                }
            }
        }
    }

    int ans = 0;
    for (int i = 0; i < k; ++i) ans = (ans + dp[h - 1][w - 1][i]) % MOD;
    printf("%d\n", ans);
    return 0;
}