#int(input())
#map(int, input().split())
#list(map(int, input().split()))

import copy
H, W, K = map(int, input().split())
S = [0] * H
for i in range(H):
    S[i] = input()

mod = 998244353

dp = [[0] * (K+1) for i in range(W)]
dp[0][K] = 1
for i in range(1, W):
    if S[0][i] == ".":
        for j in range(K+1):
            dp[i][j] = dp[i-1][j]
    elif S[0][i] == "o":
        for j in range(K):
            dp[i][j] = dp[i-1][j+1]

for h in range(1, H):
    ndp = [[0] * (K+1) for i in range(W)]
    #一番左
    if S[h][0] == ".":
        for i in range(K+1):
            ndp[0][i] = dp[0][i]
    elif S[h][0] == "o":
        for i in range(K):
            ndp[0][i] = dp[0][i+1]

    #中間
    for i in range(1, W):
        if S[h][i] == ".":
            for j in range(K+1):
                ndp[i][j] = (dp[i][j] + ndp[i-1][j]) % mod
        if S[h][i] == "o":
            for j in range(K):
                ndp[i][j] = (dp[i][j+1] + ndp[i-1][j+1]) % mod

    dp = copy.deepcopy(ndp)

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

print(ans)