H,W,K=map(int,input().split())
S=[input() for _ in range(H)]
MOD=998244353
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):
		s=S[i][j]
		if s=='#': continue
		if i:
			if s=='o':
				for k in range(1,K):
					dp[i][j][k]+=dp[i-1][j][k-1]
					dp[i][j][k]%=MOD
			else:
				for k in range(K):
					dp[i][j][k]+=dp[i-1][j][k]
					dp[i][j][k]%=MOD
		if j:
			if s=='o':
				for k in range(1,K):
					dp[i][j][k]+=dp[i][j-1][k-1]
					dp[i][j][k]%=MOD
			else:
				for k in range(K):
					dp[i][j][k]+=dp[i][j-1][k]
					dp[i][j][k]%=MOD

print(sum(dp[-1][-1])%MOD)