fixed authorization

TA.py

@@ -1,3 +1,5 @@
+import os
+
 from prompt import TA_prompt
 import re
 from utils import generate_response, run_code
@@ -54,5 +56,5 @@ if __name__ == "__main__":
 
     q = "What is the smallest even prime number?"
     # q = "Write the code to find the 1st even prime number"
-    print(solve_ta(q, "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"))
+    print(solve_ta(q, os.environ.get("HF_TOKEN")))