Thread: read integers not text

my code is below and i want to read only integers.BUT the text file is starting with text and it stops executing without reading the numbers.
Also i want to add the 3 parameters of each line.
Please help, thanks in advance.

 try{
        File fl = new File("C:/Users/Mario/Desktop/testing.txt");    
        //BufferedReader rd = new BufferedReader(new FileReader(fl));
        Scanner sc = new Scanner(fl).useDelimiter("\\s+");
        LinkedList<Integer> temps = new LinkedList<>();
        sc.useDelimiter(System.getProperty("line.separator"));
 
        while(sc.hasNext()){
         while(sc.next().matches("[0-9]+")){
            int num1=sc.nextInt();
            int num2=sc.nextInt();
            int num3=sc.nextInt();
            temps.add(num1+num2+num3);
 
         }
        }
 
        for(Integer dat:temps){
            System.out.println(dat);
        }
 
        }catch(Exception e){
            e.printStackTrace();
        }
    }