제출 #20177

실행 실패 (제출 코드 컴파일 에러)

Main.java:7: error: class B_5397 is public, should be declared in a file named B_5397.java
public class B_5397 {
       ^
Main.java:37: error: cannot find symbol
                    if(sb.isEmpty())
                         ^
  symbol:   method isEmpty()
  location: variable sb of type StringBuilder
2 errors