#include<bits/stdc++.h>
using namespace std;
bool  b[105][105];
bool end12=0;
int n,m;
void dfs(int x,int y)
{
	if(x>0&&x<=n&&y<=m&&y>0&&end12==0&&b[x][y]==1)
	{
		if(x==n&&m==y)
		{
			end12=1;
			cout<<"Yes";
			return;
		}
		b[x][y]=0;
		dfs(x,y+1);
		dfs(x,y-1);
		dfs(x-1,y);
		dfs(x+1,y);
		b[x][y]=1;
	}
	return;
}
int main()
{
	cin>>n>>m;
	getchar();
	for(int z=1;z<=n;z++)
	{
		for(int y=1;y<=m;y++)
		{
			if(getchar()=='#')
			{
				b[z][y]=0;
			}
			else
			{
				b[z][y]=1;
			}
		}
		getchar();
	}
	dfs(1,1);
	if(end12==0)
	{
		cout<<"No";
	}
	return 0;
}