Find the stray number.ipynb

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   "source": [
    "from IPython.core.interactiveshell import InteractiveShell\n",
    "InteractiveShell.ast_node_interactivity = \"all\""
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  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
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   "source": [
    "def stray(arr):\n",
    "    return [i for i in arr if arr.count(i) == 1][0]"
   ]
  }
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