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    "# Write a Python program to find the second smallest number in a list.\n",
    "# input\n",
    "# second_smallest([1, 2, -8, -2, 0])\n",
    "# output\n",
    "# -2\n",
    "\n",
    "def second_smallest(numbers):\n",
    "    a1, a2 = float('inf'), float('inf')\n",
    "    for x in numbers:\n",
    "        if x <= a1:\n",
    "            a1, a2 = x, a1\n",
    "        elif x < a2:\n",
    "            a2 = x\n",
    "    return a2\n",
    "\n",
    "print(second_smallest([1, 2, -8, -2, 0]))"
   ]
  }
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