#include<iostream>
#include<vector>
#include<atcoder/all>

using namespace std;

int main( void )
{
    int H, W, K;
    cin >> H >> W >> K;
    string S[H];
    for( int i = 0; i < H; i++ )
    {
        cin >> S[i];
    }

    vector<vector<vector<atcoder::modint998244353>>> dp( H + 2, vector<vector<atcoder::modint998244353>>( W + 2, vector<atcoder::modint998244353>( K, 0 ) ) );
    dp[1][1][0] = 1;
    for( int i = 1; i <= H; i++ )
    {
        for( int j = 1; j <= W; j++ )
        {
            if( S[i - 1][j - 1] == '#' ) continue;
            for( int k = 0; k < K; k++ )
            {
                if( S[i - 1][j - 1] == '.' )
                {
                    dp[i][j][k] += dp[i - 1][j][k] + dp[i][j - 1][k];
                }
                else if( S[i - 1][j - 1] == 'o' && k != 0 )
                {
                    dp[i][j][k] += dp[i - 1][j][k - 1] + dp[i][j - 1][k - 1];
                }
            }
        }
    }

    atcoder::modint998244353 ans = 0;
    for( int k = 0; k < K; k++ )
    {
        ans += dp[H][W][k];
    }
    cout << ans.val() << endl;

    return 0;
}