public String runOneStep(String inputNumber) {
        this.leftTimes -= 1;
        String compareResult = new Number().compareNumber(this.fourNumber, inputNumber);

        if(!compareResult.equals("4A0B") && this.leftTimes != 0) {
            return ""+compareResult+ TIPS_MESSAGE + "(" +this.leftTimes+"):\n";
        }
        else if(compareResult.equals("4A0B")){
            return SUCCESS_MESSAGE;
        }
        else {
            return GAME_OVER;
        }
    }