Update decrypt-string-from-alphabet-to-integer-mapping.py

Author: kamyu104

Python/decrypt-string-from-alphabet-to-integer-mapping.py

@@ -47,7 +47,7 @@ def alpha(num):
         return "".join(reversed(result))
 
 # Time:  O(n)
-# Space: O(n)
+# Space: O(1)
 import re