#include<bits/stdc++.h> 
using namespace std; 
int main(){ 
    cout<<"      *"<<endl<<"      **"<<endl<<"*     ***"<<endl<<"**    ****"<<endl;
    cout<<"**************"<<endl;
    cout<<"**    ****"<<endl<<"*     ***"<<endl<<"      **"<<endl<<"      *";
    return 0; 
}