제출 #18394

실행 실패 (제출 코드 컴파일 에러)

Main.java:22: error: cannot find symbol
            sb.append(convertToChar(r));
            ^
  symbol:   variable sb
  location: class Main
Main.java:26: error: cannot find symbol
            sb.append(convertToChar(n));
            ^
  symbol:   variable sb
  location: class Main
Main.java:28: error: cannot find symbol
        return sb.reverse().toString();
               ^
  symbol:   variable sb
  location: class Main
3 errors