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