MOD = 998244353
H,W,K = map(int,input().split())
S = [input() for _ in range(H)]
dp = [[[0] * K for _ in range(W)] for _ in range(H)]
dp[0][0][0] = 1
for i in range(H):
    for j in range(W):
        if S[i][j] == ".":
            for k in range(K):
                if i > 0:
                    dp[i][j][k] += dp[i-1][j][k]
                if j > 0:
                    dp[i][j][k] += dp[i][j-1][k]
                dp[i][j][k] %= MOD
        elif S[i][j] == "o":
            for k in range(K-1):
                if i > 0:
                    dp[i][j][k+1] += dp[i-1][j][k]
                if j > 0:
                    dp[i][j][k+1] += dp[i][j-1][k]
                dp[i][j][k] %= MOD
print(sum(dp[-1][-1]) % MOD)