Day 3

day3-2.py

@@ -26,7 +26,7 @@ def main():
         first, second, third = [set(elf) for elf in group]
         debug(first, second, third)
         debug(first & second & third)
-        common_item = list(first.intersection(second, third))[0]
+        common_item = list(first & second & third)[0]
         values.append(ascii_letters.index(common_item)+1)
     
     print(sum(values))