BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); ArrayList<String> cadenas = new ArrayList<>(); for(int i = 0; i < 10; i++){ cadenas.add(reader.readLine()); } String first = cadenas.get(0); for(int i = 1; i < cadenas.size(); i++){ if(cadenas.get(i).length() < first.length()){ System.out.println(i); break; } }