#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
    int i,j;

    int n = 20;

    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n-i;j++)
        {
        	cout<<" ";
        }
        for(j=n-i+1;j<=n;j++)
        {
            cout<<"*";
        }
        for(j=n+1;j<n+i;j++)
        {
            cout<<"*";
        }
        cout<<endl;
    }
    getchar();
    getchar();
    return(0);
}