{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "world hello\n"
     ]
    }
   ],
   "source": [
    "# Write a Python class to reverse a string word by word.\n",
    "# Input \"hello world\"\n",
    "# Output \"world hello\"\n",
    "\n",
    "class py_solution:\n",
    "    def reverse_words(self, s):\n",
    "        return ' '.join(reversed(s.split()))\n",
    "\n",
    "\n",
    "print(py_solution().reverse_words('hello world'))\n"
   ]
  }
 ],
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