small fix

app.py

@@ -102,7 +102,7 @@ def find_best_price(request):
         f"Printer 2: {printer_2}\n"
         f"Printer 3: {printer_3}\n"
         "For each request, you should:\n"
-        "1. Check if the requested size (3x3 or 6x6 cm) is available. If not, suggest the nearest available size.\n"
+        "1. Check if the requested size is available. If not, check if vendor supports custom sizes.\n"
         "2. Calculate the final price by:\n"
         "   - Finding the nearest lower quantity in the base price list\n"
         "   - Multiplying by the size multiplier\n"