#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );
using namespace std;
using ll = long long;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
const ll INF = 1e9;
const ll MOD = 1e9 + 7;

int main(){
    string s;
    cin >> s;

    int n = s[s.size()-1] - '0';
    if(n == 3)  cout << "bon" << endl;
    else if(n == 0 || n == 1 || n == 6 || n == 8) cout << "pon" << endl;
    else cout << hon << endl;
}