public class CCNumber
{
   public static void main(String[] args)
   {
      String creditCardNumber = "4123-5678-9012-3450";
      
      int i = 0;
      while (i < creditCardNumber.length())
      {
         char ch = creditCardNumber.charAt(i);
         if (ch == ' ' || ch == "-")         
         {
            String before = creditCardNumber.substring(0, i);
            String after = creditCardNumber.substring(i + 1);
            creditCardNumber = before + after;
         }
         else
         {
            i++;
         }
      }
      
      System.out.println(creditCardNumber);      
   }
}