"""


"""

import sys
from sys import stdin

H,W,K = map(int,stdin.readline().split())

S = [stdin.readline()[:-1] for i in range(H)]

dp = [[[0] * K for j in range(W)] for i in range(H)]

dp[0][0][0] = 1
mod = 998244353

for i in range(H):
    for j in range(W):
        for k in range(K):

            if dp[i][j][k] == 0:
                continue

            for nx,ny in ( (i,j+1),(i+1,j) ):

                if nx < H and ny < W and S[nx][ny] != "#":
                    nk = k + (1 if S[nx][ny] == "o" else 0)

                    if nk < K:

                        dp[nx][ny][nk] += dp[i][j][k]
                        dp[nx][ny][nk] %= mod

ans = sum(dp[-1][-1]) % mod

print (ans)