diff --git a/reasoning_gym/arithmetic/decimal_arithmetic.py b/reasoning_gym/arithmetic/decimal_arithmetic.py
index 32335a50..da84f28e 100644
--- a/reasoning_gym/arithmetic/decimal_arithmetic.py
+++ b/reasoning_gym/arithmetic/decimal_arithmetic.py
@@ -1,6 +1,6 @@
 from dataclasses import dataclass
 from random import Random
-from typing import Any, Literal, Optional, Dict
+from typing import Any, Dict, Literal, Optional
 
 from ..factory import ProceduralDataset, register_dataset
 
@@ -21,42 +21,42 @@ class DecimalArithmeticDatasetConfig:
 def generate_arithmetic_problem(rng, num_decimal_places, operations=None):
     """
     Generates simple arithmetic problems with decimal numbers formatted to a specific number of decimal places.
-    
+
     Parameters:
         rng
         num_problems (int): Number of problems to generate
         num_decimal_places (int): Number of decimal places for the numbers
         operations (list): List of operations to use (default: ['+', '-', '*', '/'])
-    
+
     Returns:
         list: List of formatted arithmetic problem strings
     """
     if operations is None:
-        operations = ['+', '-', '*', '/']
-    
+        operations = ["+", "-", "*", "/"]
+
     max_integer_part = 10  # Maximum whole number portion before decimal
-    max_value = max_integer_part * (10 ** num_decimal_places)
-    
+    max_value = max_integer_part * (10**num_decimal_places)
+
     problem = None
 
     # Generate random numbers with exact decimal places
-    num1 = rng.randint(1, max_value) / (10 ** num_decimal_places)
-    num2 = rng.randint(1, max_value) / (10 ** num_decimal_places)
-    
+    num1 = rng.randint(1, max_value) / (10**num_decimal_places)
+    num2 = rng.randint(1, max_value) / (10**num_decimal_places)
+
     # Select random operation
     op = rng.choice(operations)
-    
+
     # Format numbers to ensure exact decimal places
     formatted_num1 = f"{num1:.{num_decimal_places}f}"
     formatted_num2 = f"{num2:.{num_decimal_places}f}"
-    
+
     problem = f"{formatted_num1} {op} {formatted_num2} = ?"
-    
+
     return problem
 
 
 def eval_floordiv(exp: str) -> int:
-    return eval(exp.replace("/", "//").replace(" = ?", ''))
+    return eval(exp.replace("/", "//").replace(" = ?", ""))
 
 
 class DecimalArithmeticDataset(ProceduralDataset):
@@ -83,13 +83,7 @@ class DecimalArithmeticDataset(ProceduralDataset):
         decimal_problem = generate_arithmetic_problem(rng, self.config.num_decimal_places)
         answer = eval_floordiv(decimal_problem)
 
-        return {
-            "question": decimal_problem,
-            "answer": answer,
-            "metadata": {
-                
-            }
-        }
+        return {"question": decimal_problem, "answer": answer, "metadata": {}}
 
     def score_answer(self, answer: Optional[str], entry: Dict[str, any]) -> float:
         """Determine if the solution provided solves the Sokoban task.
@@ -108,12 +102,13 @@ class DecimalArithmeticDataset(ProceduralDataset):
             return 0.0
 
         try:
-            if float(answer) == entry['answer']:
+            if float(answer) == entry["answer"]:
                 return 1.0
         except Exception as e:
             return 0.01
 
         return 0.01
 
+
 # Register the dataset
 register_dataset("decimal_arithmetic", DecimalArithmeticDataset, DecimalArithmeticDatasetConfig)
diff --git a/reasoning_gym/code/bf.py b/reasoning_gym/code/bf.py
index c2697203..58b55f23 100644
--- a/reasoning_gym/code/bf.py
+++ b/reasoning_gym/code/bf.py
@@ -28,7 +28,7 @@ class BFDataset(ProceduralDataset):
 
     def __init__(self, config: BFConfig):
         self._prompt_templates = [
-            "This is a BF (Brainf*ck) computer program. What is the output? \n\n{bf_program}",
+            "This is a BF (Brainf*ck) computer program. What is the output? Reply only with the program output, ex: 42. \n\n{bf_program}",
         ]
         super().__init__(config=config, seed=config.seed, size=config.size)
 
diff --git a/tests/test_decimal_arithmetic.py b/tests/test_decimal_arithmetic.py
index c499105c..5f303527 100644
--- a/tests/test_decimal_arithmetic.py
+++ b/tests/test_decimal_arithmetic.py
@@ -1,6 +1,6 @@
 import pytest
 
-from reasoning_gym.arithmetic.decimal_arithmetic import DecimalArithmeticDatasetConfig, DecimalArithmeticDataset
+from reasoning_gym.arithmetic.decimal_arithmetic import DecimalArithmeticDataset, DecimalArithmeticDatasetConfig
 
 
 def test_decimal_arithmetic():
@@ -41,4 +41,4 @@ def test_decimal_arithmetic():
         assert "answer" in item
         assert "metadata" in item
 
-        assert dataset.score_answer(answer=item["answer"], entry=item) == 1.0
\ No newline at end of file
+        assert dataset.score_answer(answer=item["answer"], entry=item) == 1.0