const main = (str) => {
    const last = str.slice(-1);
    if(last === '2' || last === '4' || last === '5' || last === '7' || last === '9'){
        console.log('hon');
    }else if(last === '0' || last === '1' || last === '6' || last === '8'){
        console.log('pon');
    }else{
        console.log('bon');
    }
};

main(require('fs').readFileSync('/dev/stdin', 'utf8'));