H, W, K = map(int, input().split())
S = []
for i in range(H):
    S.append(list(input()))
    
dp = [[[0] * (K + 2) for i in range(W)] for j in range(H)]
dp[0][0][K] = 1
mod = 998244353
for i in range(H):
    for j in range(W):
        if S[i][j] == "#":
            continue
        for k in range(K + 1):
            if i:
                if S[i][j] == ".":
                    dp[i][j][k] += dp[i - 1][j][k]
                else:
                    dp[i][j][k] += dp[i - 1][j][k + 1]
            if j:
                if S[i][j] == ".":
                    dp[i][j][k] += dp[i][j - 1][k]
                else:
                    dp[i][j][k] += dp[i][j - 1][k + 1]
            dp[i][j][k] %= mod
        
ans = 0
for i in range(1, K + 1):
    ans += dp[H-1][W-1][i]
    ans %= mod 
print(ans)