diff --git a/src/llm.py b/src/llm.py
index 70937f9..3ed6761 100644
--- a/src/llm.py
+++ b/src/llm.py
@@ -46,7 +46,7 @@ def build_prompt(self, current_field):
 
     def main_loop(self):
         # self.type_check_all()
-        for field in self._target_fields.keys():
+        for field in self._target_fields:
             prompt = self.build_prompt(field)
             # print(prompt)
             # ollama_url = "http://localhost:11434/api/generate"
diff --git a/src/main.py b/src/main.py
index 5bb632b..a1bd4f1 100644
--- a/src/main.py
+++ b/src/main.py
@@ -3,6 +3,9 @@
 from commonforms import prepare_form 
 from pypdf import PdfReader
 from controller import Controller
+from typing import Union
+import os
+import tempfile
 
 def input_fields(num_fields: int):
     fields = []
@@ -68,16 +71,26 @@ def run_pdf_fill_process(user_input: str, definitions: list, pdf_form_path: Unio
 if __name__ == "__main__":
     file = "./src/inputs/file.pdf"
     user_input = "Hi. The employee's name is John Doe. His job title is managing director. His department supervisor is Jane Doe. His phone number is 123456. His email is jdoe@ucsc.edu. The signature is <Mamañema>, and the date is 01/02/2005"
-    fields = ["Employee's name", "Employee's job title", "Employee's department supervisor", "Employee's phone number", "Employee's email", "Signature", "Date"]
-    prepared_pdf = "temp_outfile.pdf"
-    prepare_form(file, prepared_pdf)
+    descriptive_fields = ["Employee's name", "Employee's job title", "Employee's department supervisor", "Employee's phone number", "Employee's email", "Signature", "Date"]
+    fd, temp_path = tempfile.mkstemp(suffix=".pdf")
+    os.close(fd)  # Close the file descriptor so prepare_form can safely write to it
     
-    reader = PdfReader(prepared_pdf)
-    fields = reader.get_fields()
-    if(fields):
-        num_fields = len(fields)
-    else:
-        num_fields = 0
+    try:
+        # 2. Use our secure, collision-proof path
+        prepare_form(file, temp_path)
+        
+        reader = PdfReader(temp_path)
+        fields = reader.get_fields()
+        
+        if fields:
+            num_fields = len(fields)
+        else:
+            num_fields = 0
+            
+        controller = Controller()
+        controller.fill_form(user_input, descriptive_fields, file)
         
-    controller = Controller()
-    controller.fill_form(user_input, fields, file)
+    finally:
+        # 3. Guarantee the OS deletes this specific file when we are done
+        if os.path.exists(temp_path):
+            os.remove(temp_path)