Update app.py

app.py

@@ -125,6 +125,10 @@ class BasicAgent:
     def _yt_mobile_url(self, url: str) -> str:
         return re.sub(r"^https://www\.youtube\.com", "https://m.youtube.com", url)
 
+    def _extract_video_id(url: str) -> str | None:
+        m = re.search(r"[?&]v=([\w-]{6,})", url)
+        return m.group(1) if m else None
+
     def _fetch_yt_html(self, url: str) -> str | None:
         try:
             r = requests.get(self._yt_mobile_url(url),
@@ -162,12 +166,19 @@ class BasicAgent:
                     return str(n)  # EXACT MATCH wants bare number
             # Deterministic LLM fallback constrained to description only
             yt_sys = (
-                "Answer with ONLY the final number. Use only the official video description text. "
-                "Count distinct bird species explicitly mentioned (e.g., Emperor penguin, Adélie penguin, Giant petrel)."
+                "Return ONLY the number (digits only, no words, no punctuation). "
+                "Count the distinct bird species explicitly mentioned in the official video description (e.g., Emperor penguin, Adélie penguin, Giant petrel)."
             )
             raw = self._llm(f"{yt_sys}\n\nQuestion: {question}")
-            return format_final_answer(question, raw)
+            num = _extract_bare_number(raw)
+
+            if num is None:
+                # second attempt: ultra-strict
+                raw2 = self._llm("Output only a single integer with no other text.\n" + question)
+                num = _extract_bare_number(raw2)
 
+            if num is not None:
+                return num
 
         # 1) quick math
         calc = self._maybe_calc(question)