#include
using namespace std;
int main(){
int n,m;
cin>>n>>m;
// bool is = true;
for(int i=1;i<=n;i++){
if(i%4==2){
for(int i=1;i cout<<".";
}
cout<<"#";
}else if(i%4==0){
cout<<"#";
for(int i=1;i cout<<".";
}
}else{
for(int i=1;i<=m;i++){
cout<<"#";
}
}
cout<<"\n";
}
return 0;
}
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