#include <iostream>
using namespace std;

int main() {
    int n = 4;

    for (int i = 1; i <= n; i++) {

        
        for (int j = 1; j <= n - i; j++) {
            cout << "  ";
        }

       
        for (int j = 1; j <= 2 * i - 1; j++) {
            cout << "o ";
        }

        cout << endl;
    }

    return 0;
}