#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin<<n;
    if(n/10==3)
    {
        cout<<"bon";
    }
    else if(n/10==0||n/10==1||n/10==6||n/10==8)
    {
        cout<<"pon";
    }
    else 
    {
        cout<<"bon";
    }
}