#include <iostream>

using namespace std;

void ftriangle(int end){
    int index = 0;
    for(; index <= end; index++){
        cout << "*";
    }
    cout << " ";
}

void inv_ftriangle(int start){
    int end = 0;
    for(; start > end; start--){
        cout << "*";
    }
    cout << " ";
}

int main(){
    int index;
    int end = 20; // Change this to make a bigger/smaller triangle

    for(index = 0; index < end; index++){
        ftriangle(index);
        inv_ftriangle(end - index);
        inv_ftriangle(end - index);
        ftriangle(index);

        cout << endl;
    }
    cin.get();
    cin.get();
    return 0;
}