diff --git a/reasoning_gym/algorithmic/cryptarithm.py b/reasoning_gym/algorithmic/cryptarithm.py
index 784e1702..952943b8 100644
--- a/reasoning_gym/algorithmic/cryptarithm.py
+++ b/reasoning_gym/algorithmic/cryptarithm.py
@@ -95,7 +95,10 @@ def verify_cryptarithm_solution(
         # Check if sum is correct
         computed_sum = sum(word_numbers)
         if computed_sum != result_number:
-            return False, f"Arithmetic equation not satisfied: {word_numbers} sums to {computed_sum}, expected {result_number}"
+            return (
+                False,
+                f"Arithmetic equation not satisfied: {word_numbers} sums to {computed_sum}, expected {result_number}",
+            )
 
     except (KeyError, ValueError) as e:
         return False, f"Error applying mapping: {e}"
diff --git a/tests/test_cryptarithm.py b/tests/test_cryptarithm.py
index 1d454be1..396b8b3c 100644
--- a/tests/test_cryptarithm.py
+++ b/tests/test_cryptarithm.py
@@ -125,7 +125,9 @@ def test_cryptarithm_score_answer():
     for pair in correct_answer_str.split(","):
         alpha, num_str = pair.split("=")
         correct_mapping[alpha] = int(num_str)
-    reversed_answer = ",".join(f"{letter}={correct_mapping[letter]}" for letter in reversed(sorted(correct_mapping.keys())))
+    reversed_answer = ",".join(
+        f"{letter}={correct_mapping[letter]}" for letter in reversed(sorted(correct_mapping.keys()))
+    )
     score = dataset.score_answer(answer=reversed_answer, entry=puzzle)
     assert score == 1.0, f"Expected 1.0 for correct answer in different order, got {score}"