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+# 344. Reverse String
+
+"""
+write a function that reverses a string. the input string is given as an
+array of characters 's'. you must do this by modifying teh input array in
+place with 'O(1)' extra memroy
+"""
+
+
+class Solution(object):
+ def reverseString(self, s):
+ """
+ :type s: List[str]
+ :rtype: None Do not return anything, modify s in-place instead.
+ """
+ s[:] = s[::-1]
+
+
+if __name__ == "__main__":
+ obj = Solution()
+ s1 = "hello"
+ s2 = "Hannah"
+ obj.reverseString(s1)
+ obj.reverseString(s2)
+ print(s1)
+ print(s2)