h,w,k = map(int,input().split())
grid = []
for i in range(h):
    grid.append(list(input()))
mod = 998244353
dist = [[[0 for i in range(w)] for j in range(h) ] for wfo2bor3 in range(k+1)]
dist[k][0][0] = 1

for i in range(h):
    for j in range(w):
        for health in range(k+1):
            if i != h-1:
                if grid[i+1][j] == '.':
                    dist[health][i+1][j] += dist[health][i][j]
                    dist[health][i+1][j] %= mod
                if grid[i+1][j] == 'o' and health >= 2:
                    dist[health-1][i+1][j] += dist[health][i][j]
                    dist[health-1][i+1][j] %= mod
            
            if j != w-1:
                if grid[i][j+1] == '.':
                    dist[health][i][j+1] += dist[health][i][j]
                    dist[health][i][j+1] %= mod
                if grid[i][j+1] == 'o' and health >= 2:
                    dist[health-1][i][j+1] += dist[health][i][j]
                    dist[health-1][i][j+1] %= mod
ans = 0
for i in range(1,k+1):
    ans += dist[i][h-1][w-1]
    ans %= mod
print(ans)