private void setVariablesType(ArrayList<Node> variables) {
   variables.forEach(
       (v) -> {
         Node type = v.getChildren().get(1);
         Node listId = v.getChildren().get(0);
         listId
             .getChildren()
             .forEach(
                 (id) -> {
                   int tag = 0;
                   if (type.getTag() == Tag.REAL) {
                     tag = Tag.REAL_NUM;
                   } else {
                     if (type.getTag() == Tag.INTEGER) {
                       tag = Tag.INT_NUM;
                     } else {
                       tag = Tag.BOOL_NUM;
                     }
                   }
                   syntaxAnalyser.setVariableType(new Word(id.getStrValue(), id.getTag()), tag);
                 });
       });
 }