import sys, time, random
from collections import deque, Counter, defaultdict
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

h, w, k = mi()

s = [input() for _ in range(h)]

dp = [[[0] * (k + 1) for _ in range(w + 1)] for _ in range(h + 1)]

dp[0][0][k] = 1

for i in range(h):
    for j in range(w):
        if s[i][j] == '#':
            continue
        if s[i][j] == 'o':
            for x in range(1, k + 1):
                if i - 1 >= 0:
                    dp[i][j][x - 1] += dp[i - 1][j][x]
                if j - 1 >= 0:
                    dp[i][j][x - 1] += dp[i][j - 1][x]
                dp[i][j][x - 1] %= mod
        else:
            for x in range(k + 1):
                if i - 1 >= 0:
                    dp[i][j][x] += dp[i - 1][j][x]
                if j - 1 >= 0:
                    dp[i][j][x] += dp[i][j - 1][x]
                dp[i][j][x] %= mod
ans = 0
for i in range(1, k + 1):
    ans += dp[h - 1][w - 1][i]
print(ans % mod)