import sys
input = sys.stdin.readline

mod=998244353

H,W,K=map(int,input().split())
MAP=[input().strip() for i in range(H)]

DP=[[[0]*W for i in range(H)] for j in range(K+1)]
DP[0][0][0]=1

for i in range(H):
    for j in range(W):
        for k in range(K):

            x=i+1
            y=j
            if x<H:

                if MAP[x][y]==".":
                    DP[k][x][y]+=DP[k][i][j]
                    DP[k][x][y]%=mod

                elif MAP[x][y]=="o":
                    DP[k+1][x][y]+=DP[k][i][j]
                    DP[k+1][x][y]%=mod

            x=i
            y=j+1
            if y<W:

                if MAP[x][y]==".":
                    DP[k][x][y]+=DP[k][i][j]
                    DP[k][x][y]%=mod

                elif MAP[x][y]=="o":
                    DP[k+1][x][y]+=DP[k][i][j]
                    DP[k+1][x][y]%=mod

ANS=0
for i in range(K):
    ANS+=DP[i][H-1][W-1]
    ANS%=mod

print(ANS)