import sys
from itertools import permutations
import heapq

input = lambda :sys.stdin.readline().rstrip()
mi = lambda :map(int,input().split())
li = lambda :list(mi())

mod = 998244353

H,W,K = mi()
S = [input() for i in range(H)]

dp = [[[0]*(K) for j in range(W)] for i in range(H)]
dp[0][0][0] = 1
for i in range(H):
    for j in range(W):
        for k in range(K):
            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" and k+1 < K:
                    dp[i+1][j][k+1] += dp[i][j][k]
                    dp[i+1][j][k+1] %= 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" and k+1 < K:
                    dp[i][j+1][k+1] += dp[i][j][k]
                    dp[i][j+1][k+1] %= mod

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