package main

import . "fmt"

func main() {
	var h,w,k int
	Scan(&h,&w,&k)
	s := make([]string, h)
	for i := range s {
		Scan(&s[i])
	}
	dp := make([][][]int, h+w+2)
	for i := range dp {
		dp[i] = make([][]int, h)
		for j := range dp[i] {
			dp[i][j] = make([]int, w)
		}
	}
	visited := make([][]bool, h)
	for i := range visited {
		visited[i] = make([]bool, w)
	}
	const Mod = 998244353
	dp[0][0][0] = 1
	cur := []int{0,0}
	for i := 0; i < h+w+1; i++ {
		tmp := []int{}
		for len(cur) > 0 {
			l := len(cur)
			y, x := cur[l-2], cur[l-1]
			cur = cur[:l-2]
			if x + 1 < w {
				switch s[y][x+1] {
					case '.':
						for j := 0; j <= i; j++ {
							dp[j][y][x+1] += dp[j][y][x]
							dp[j][y][x+1] %= Mod
						}
						if !visited[y][x+1] {
							visited[y][x+1] = true
							tmp = append(tmp, y, x+1)
						}
					case 'o':
						for j := 0; j <= i && j+1 < k; j++ {
							dp[j+1][y][x+1] += dp[j][y][x]
							dp[j+1][y][x+1] %= Mod
						}
						if !visited[y][x+1] {
							visited[y][x+1] = true
							tmp = append(tmp, y, x+1)
						}
				}
			}
			if y + 1 < h {
				switch s[y+1][x] {
					case '.':
						for j := 0; j <= i; j++ {
							dp[j][y+1][x] += dp[j][y][x]
							dp[j][y+1][x] %= Mod
						}
						if !visited[y+1][x] {
							visited[y+1][x] = true
							tmp = append(tmp, y+1, x)
						}
					case 'o':
						for j := 0; j <= i && j+1 < k; j++ {
							dp[j+1][y+1][x] += dp[j][y][x]
							dp[j+1][y+1][x] %= Mod
						}
						if !visited[y+1][x] {
							visited[y+1][x] = true
							tmp = append(tmp, y+1, x)
						}
				}
			}
		}
		cur = tmp
	}
	ans := 0
	for i := 0; i < k; i++ {
		ans += dp[i][h-1][w-1]
		ans %= Mod
	}
	Println(ans)
}