import sys
input = sys.stdin.readline

mod = 998244353
H, W, K = map(int, input().split())
S = [input().rstrip() for _ in range(H)]

dp = [[[0] * (K+1) for _ in range(W)] for _ in range(H)]
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 k in range(K):
                dp[i][j][k] = dp[i][j][k+1]
            dp[i][j][K] = 0

        if i < H-1 and S[i+1][j] != '#':
            for k in range(K+1):
                dp[i+1][j][k] = (dp[i+1][j][k] + dp[i][j][k]) % mod
        if j < W-1 and S[i][j+1] != '#':
            for k in range(K+1):
                dp[i][j+1][k] = (dp[i][j+1][k] + dp[i][j][k]) % mod
ans = (sum(dp[H-1][W-1]) - dp[H-1][W-1][0]) % mod
print(ans)