#define MD 998244353
Mint f[101][101][201];
{
	ll@h,@w,@k;
	string@s[h];
	f[0][0][k-1]=1;
	rep(y,h){
		rep(x,w){
			ll c=s[y][x];
			if(c=='.'){
				rep(u,k){
					f[y+1][x][u]+=f[y][x][u];
					f[y][x+1][u]+=f[y][x][u];
				}
			}
			if(c=='o'){
				rep(u,k-1){
					f[y+1][x][u]+=f[y][x][u+1];
					f[y][x+1][u]+=f[y][x][u+1];
				}
			}
		}
	}
	wt(sum(((f[h-1][w-1]))(k)));
}