include

using namespace std;
int main()
{
char ch,i,k,z,j;
cin>>ch;
for(i='A';i<=ch;i++)
{
for(j=i;j<ch;j++)
cout<<" ";
for(k='A';k<=i;k++)
cout<<k;
for(z=k-2;z>='A';z--)
cout<<z;
cout<<endl;
}
return 0;
}