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