So, im trying this for so long, and with a lot of diferents codes, can someone help me? why this has WA?

public class Main {

        static InputStreamReader ir = new InputStreamReader(System.in);
       static BufferedReader in = new BufferedReader(ir);

        public static int buildObjetos(LinkedList<Integer> objetos, int n) throws IOException {

            while (n != 0) {
                n--;

                int inicio = 0, fim = 0;
                inicio = in.read();
                fim = in.read();
                if(inicio > fim || inicio > 100 || fim > 100 || inicio < 1 || fim < 1) {
                    return -1;
                }
                while (inicio <= fim) {
                    objetos.add(inicio);
                    inicio++;
                }
            }
            return 0;
        }

        public static void main (String[] args) throws IOException {

            while (in.ready()) {
                int n = in.read();
                if(n > 100 || n < 1) {
                    break;
                }

                LinkedList<Integer> objetos = new LinkedList<>();
                int exit = buildObjetos(objetos, n);
                if(exit == -1) {
                    break;
                }
                objetos.sort(null);

                int s = in.read();

                if(s > 100 || s < 1 || objetos.size() > 10000) {
                    break;
                }

                int ini = objetos.indexOf(s);
                int fin = objetos.lastIndexOf(s);

                if(ini == -1) {
                    System.out.println(s + " not found");
                }else {
                    System.out.println(s + " found from " + ini + " to " + fin);
                }
                n = 0;
            }   } }