diff --git a/2023/day1.py b/2023/day1.py
index 9bf9b82..a44fbd0 100644
--- a/2023/day1.py
+++ b/2023/day1.py
@@ -3,7 +3,7 @@ import sys
 
 lines = sys.stdin.read().split("\n")
 
-lookups_1 = {d: int(d) for d in string.digits}
+lookups_1 = {d: int(d) for d in string.digits[1:]}
 lookups_2 = lookups_1 | {
     d: i + 1
     for i, d in enumerate(
@@ -34,8 +34,9 @@ def find_values(lookups: dict[str, int]) -> list[int]:
         )
         last_digit = max(
             lookups,
-            key=lambda lookup: index if (index := line.rfind(lookup)) >= 0 else 0,
+            key=lambda lookup: index if (index := line.rfind(lookup)) >= 0 else -1,
         )
+
         values.append(10 * lookups[first_digit] + lookups[last_digit])
 
     return values