@@ -0,0 +1,544 @@
+import java.util.*;%0Aimport java.lang.*;%0Aimport java.io.*;%0Apublic class Main %7B%0A  public static StringBuilder work(StringBuilder a, StringBuilder b) %7B%0A    a = new StringBuilder(%22BBB%22);%0A    b.append(%22AAA%22);%0A    return a;%0A  %7D%0A %0A  public static void main(String%5B%5D args) %7B%0A    StringBuilder s1 = new StringBuilder(%22StringBuilder1%22);%0A    StringBuilder s2 = new StringBuilder(%22StringBuilder2%22);%0A    StringBuilder s3 = work(s1, s2);%0A    System.out.println(%22s1 = %22 + s1);%0A    System.out.println(%22s2 = %22 + s2);%0A    System.out.println(%22s3 = %22 + s3);%0A  %7D%0A%7D%0A

Create oca-1.java