H,W,K=map(int, input().split())
dp=[[[0]*(K+1) for i in range(W+1)] for j in range(H+1)]
dp[0][0][0]=1
A=[]
for i in range(H):
  S=input()
  A.append(S+'#')
A.append('#'*(W+1))

mod=998244353
for h in range(H):
  for w in range(W):
    if A[h][w]=='#':
      continue
    for k in range(K):
      if A[h+1][w]=='.':
        dp[h+1][w][k]+=dp[h][w][k]
        dp[h+1][w][k]%=mod 
      elif A[h+1][w]=='o':
        dp[h+1][w][k+1]+=dp[h][w][k]
        dp[h+1][w][k+1]%=mod 
      if A[h][w+1]=='.':
        dp[h][w+1][k]+=dp[h][w][k]
        dp[h][w+1][k]%=mod 
      elif A[h][w+1]=='o':
        dp[h][w+1][k+1]+=dp[h][w][k]
        dp[h][w+1][k+1]%=mod 


ans=0
for a in dp[H-1][W-1]:
  ans+=a 
  ans%=mod 
print(ans)