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