Update decode-string.py

Author: kamyu104

Python/decode-string.py

@@ -11,14 +11,13 @@ def decodeString(self, s):
         for c in s:
             if c.isdigit():
                 n = n*10 + ord(c)-ord('0')
+            elif c.isalpha():
+                curr.append(c)
             elif c == '[':
                 nums.append(n)
                 strs.append(curr)
                 n, curr = 0, []
             elif c == ']':
                 strs[-1].extend(curr*nums.pop())
                 curr = strs.pop()
-            else:
-                curr.append(c)
         return "".join(curr)
-