update return msg

app.py

@@ -1,31 +1,17 @@
 from flask import Flask, request, jsonify, render_template
-from detectron2.config import get_cfg
-from detectron2.engine import DefaultPredictor
-from detectron2.data import MetadataCatalog
-from detectron2.utils.visualizer import Visualizer, ColorMode
-import numpy as np
 from PIL import Image
 import io
 import os
 import requests
-import gdown
-from skimage import io as skio
-from torchvision.ops import box_iou
-import torch
 from roboflow import Roboflow
 import supervision as sv
 import cv2
 import tempfile
 import os
-import numpy as np
 import requests
-import fitz  # PyMuPDF
 import requests
-from openai import OpenAI
-from fpdf import FPDF
 import cloudinary
 import cloudinary.uploader
-from PyPDF2 import PdfMerger
 from a import main
 
 # Initialize Flask app