/* package whatever; // don't place package name! */
 
/* The class name doesn't have to be Main, as long as the class is not public. */
class Main
{
  public static void main (String[] args) throws java.lang.Exception
  {
     String myString = "{U1,U2,U3},{U5,U7},{U4,U6,U8}";
     int begin = 0;
     int end = 0;
     String s1;
     while (end != -1){     
     end = myString.indexOf("},{", begin);
     if ((end < myString.length()) && ((begin < end)))
       s1 = myString.substring(begin, end + 1);
     else
       s1 = myString.substring(begin);
     begin = end + 2;
     System.out.println(s1);
     }
  }
}
 

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