import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
h, w, k = na()
mod = 998244353
dp = [[[0 for j in range(w)]for i in range(h)]for t in range(k)]
dp[0][0][0] = 1
s = [input() for i in range(h)]
for t in range(k):
    for i in range(h):
        for j in range(w):
            if i < h - 1:
                ni = i + 1
                nj = j
                nt = t
                if s[ni][nj] == "o":
                    nt += 1
                if s[ni][nj] == "#":
                    nt += 100000000
                if nt < k:
                    dp[nt][ni][nj] += dp[t][i][j]
                    dp[nt][ni][nj] %= mod
            if j < w-1:
                ni = i 
                nj = j+1
                nt = t
                if s[ni][nj] == "o":
                    nt += 1
                if s[ni][nj] == "#":
                    nt += 100000000
                if nt < k:
                    dp[nt][ni][nj] += dp[t][i][j]
                    dp[nt][ni][nj] %= mod

ans = 0
for i in range(k):
    ans += dp[i][-1][-1]
    ans %= mod
print(ans)