MOD = 998244353

H, W, K = map(int, input().split())
grid = [list(input().strip()) for _ in range(H)]

# Initialize DP table with H rows, W columns, K damage counts (0 to K-1)
dp = [[[0] * K for _ in range(W)] for __ in range(H)]

# Starting cell (0,0) is '.', damage 0 has 1 way
if grid[0][0] == '.':
    dp[0][0][0] = 1

for i in range(H):
    for j in range(W):
        if i == 0 and j == 0:
            continue  # Already initialized
        if grid[i][j] == '#':
            continue  # Skip walls
        current = grid[i][j]
        for k in range(K):
            required_prev = -1
            if current == 'o':
                required_prev = k - 1
                if required_prev < 0:
                    continue  # No possible previous state
            else:
                required_prev = k
            ways = 0
            # Check cell above (i-1, j)
            if i > 0 and grid[i-1][j] != '#':
                if 0 <= required_prev < K:
                    ways += dp[i-1][j][required_prev]
            # Check cell to the left (i, j-1)
            if j > 0 and grid[i][j-1] != '#':
                if 0 <= required_prev < K:
                    ways += dp[i][j-1][required_prev]
            dp[i][j][k] = ways % MOD

# Sum all valid damage counts for the destination
answer = sum(dp[H-1][W-1][k] for k in range(K)) % MOD
print(answer)