from collections import *
from itertools import *
from functools import *
import sys,math
input = sys.stdin.readline

H,W,K = map(int,input().split())
mod = 998244353
dp = [[[0]*(K+2) for _ in range(W)] for i in range(H)]
S = [list(input())[:-1] for _ in range(H)]
dp[0][0][0] = 1

for i in range(H):
    for j in range(W):
        
        for k in range(K+1):
            
            if (i+1 < H):
                
                if S[i+1][j]=='.':
                    
                    dp[i+1][j][k] += dp[i][j][k]
                    dp[i+1][j][k] %= mod
                elif S[i+1][j]=='o':
                    
                    dp[i+1][j][k+1] += dp[i][j][k]
                    dp[i+1][j][k] %= mod
            if (j+1 < W):
                
                if S[i][j+1]=='.':
                    
                    dp[i][j+1][k] += dp[i][j][k]
                    dp[i][j+1][k] %= mod
                elif S[i][j+1]=='o':
                    
                    dp[i][j+1][k+1] += dp[i][j][k]
                    dp[i][j+1][k] %= mod

            
print(sum(dp[-1][-1][k] for k in range(K))%mod)