#include <bits/stdc++.h>
int main(int argc, const char* argv[]) {
  int N;
  scanf("%d", &N);
  while (N >= 10) {
    N = N % 10;
  }
  printf("%d", N);
  if (N == 2 || N == 4 || N == 5 || N == 7 || N == 9) {
    printf("bon");
  } else if (N == 0 || N == 1 || N == 6 || N == 8) {
    printf("pon");
  } else {
    printf("bon");
  }
  return 0;
}
