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):
            if i+1 < H and S[i+1][j] != '#':
                d = 1 if S[i+1][j] == 'o' else 0
                dp[i+1][j][k+d] += dp[i][j][k]
                dp[i+1][j][k+d] %= MOD

            if j+1 < W and S[i][j+1] != '#':
                d = 1 if S[i][j+1] == 'o' else 0
                dp[i][j+1][k+d] += dp[i][j][k]
                dp[i][j+1][k+d] %= MOD

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

print(ans)