#include<stdio.h>
int main(void)
{
  int x;
  scanf("%d",&x);
  x = x % 10;
  switch(x)
    {
    case 2: ;
    case 4: ;
    case 5: ;
    case 7: ;
    case 9:
      printf("hon\n");
      break;
    case 0: ;
    case 1: ;
    case 6: ;
    case 8:
      printf("pon\n");
      break;
    case 3:
      printf("bon\n");
      break;
    default:
      printf("error\n");
    }
  return 0;
}
