60pts#2,#3#8#9WA

#include<bits/stdc++.h>
using namespace std;
char x[101][101];
int x2[101][101]={};
bool iffi=0;
void bds(int x1,int y,int n,int m){
    if(x[x1][y]=='#')
    {
        return ;
    }
    else if(x1==m&&y==n&&iffi==0)
    {
        cout<<"Yes";
        iffi=1;
        return;
    }
    x2[x1][y]=1;
    if(x1!=1&&x2[x1-1][y]==0)
    {
        bds(x1-1,y,n,m);
    }
    if(y!=1&&x2[x1][y-1]==0)
    {
        bds(x1,y-1,n,m);
    }
    if(x1!=n&&x2[x1+1][y]==0)bds(x1+1,y,n,m);
    if(y!=n&&x2[x1][y+1]==0)bds(x1,y+1,n,m);
}
int main()
{
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=n;i++)
    {
        for(int i1=1;i1<=m;i1++)
        {
            cin>>x[i][i1];
        }
    }
    bds(1,1,m,n);
    if(iffi==0)cout<<"No";
    return 0;
}