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