def list3d(a, b, c, val=0):
    return [[[val] * c for _ in range(b)] for _ in range(a)]


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

dp = list3d(H+1, W+1, H+W+1)
dp[0][0][0] = 1
for i in range(H):
    for j in range(W):
        if S[i][j] == '#': continue
        for k in range(K):
            for dr, dc in [(1, 0), (0, 1)]:
                r = i + dr
                c = j + dc
                if not (0 <= r < H and 0 <= c < W): continue
                if S[r][c] == '#': continue
                d = 1 if S[r][c] == 'o' else 0
                dp[r][c][k+d] += dp[i][j][k]
                dp[r][c][k+d] %= MOD

ans = 0
for k in range(K):
    ans += dp[H-1][W-1][k]
    ans %= MOD

print(ans)