h,w,k = map(int,input().split())
S = [input() for i in range(h)]
mod = 998244353

dp = [[[0]*k for i in range(w)] for j in range(h)]
dp[0][0][k-1] = 1

for i in range(h):
    for j in range(w):
        s = S[i][j]
        if s == "#":
            continue

        for x in range(k):
            if dp[i][j][x] == 0:
                continue

            if i != h-1:
                ns = S[i+1][j]
                if ns == ".":
                    dp[i+1][j][x] += dp[i][j][x]
                    dp[i+1][j][x] %= mod
                elif ns == "o" and x:
                    dp[i+1][j][x-1] += dp[i][j][x]
                    dp[i+1][j][x-1] %= mod


            if j != w-1:
                ns = S[i][j+1]
                if ns == ".":
                    dp[i][j+1][x] += dp[i][j][x]
                    dp[i][j+1][x] %= mod
                elif ns == "o" and x:
                    dp[i][j+1][x-1] += dp[i][j][x]
                    dp[i][j+1][x-1] %= mod


print(sum(dp[-1][-1])%mod)