https://blog.gongquiz.com/2021/04/04/ascii-%ec%bd%94%eb%93%9c%ec%97%90-%eb%8c%80%ed%95%9c-%ec%84%a4%eb%aa%85%ec%9c%bc%eb%a1%9c-%ec%9e%98%eb%aa%bb%eb%90%9c-%ea%b2%83%ec%9d%80-%ec%a0%95%eb%b3%b4%ec%b2%98%eb%a6%ac%ea%b8%b0%eb%8a%a5/