      "collapsed": true
     },
     "outputs": [],
     "source": [
      "%run ../stack/stack.py\n",
      "%load ../stack/stack.py"
     ]
    },
    {
     "cell_type": "code",
     "execution_count": 2,
 
</s> remove     "            while not buff.is_empty() and buff.peek() > temp:\n",
 </s> add     "            while not buff.is_empty() and temp < buff.peek():\n", </s> remove     "                while not buff.is_empty() and buff.peek() > temp:\n",
 </s> add     "                while not buff.is_empty() and temp < buff.peek():\n", </s> remove    "version": "3.4.3"
 </s> add    "version": "3.5.0"
    "%run ../stack/stack.py"
      "collapsed": true
     },
     "outputs": [],
     "source": [
    "%run ../stack/stack.py"
    "%run ../stack/stack.py"
     ]
    },
    {
     "cell_type": "code",
     "execution_count": 2,
keep keep keep keep replace replace keep keep keep keep keep
 Update stack min challenge (#108)

Updates constraints and solution. 
stacks_queues/sort_stack/sort_stack_solution.ipynb