import os

def extract_classes_from_txt(directory, start, end, output_file):
    classes = set()
    for i in range(start, end + 1):
        file_path = os.path.join(directory, f"{i:06}.txt")
        if os.path.exists(file_path):
            with open(file_path, 'r') as file:
                for line in file:
                    class_label = line.split()[0]
                    classes.add(class_label)
        else:
            print(f"File {file_path} does not exist.")
    
    # Save the unique classes to a text file
    with open(output_file, 'w') as f:
        for class_label in sorted(classes):
            f.write(class_label + '\n')
    print(f"All unique classes have been saved to {output_file}.")

# Example usage
directory = r"C:\Users\USUARIO\Documents\GitHub\Yolov10\kitti\label_2"
extract_classes_from_txt(directory, 0, 7480, "unique_classes.txt")