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      "5\n"
     ]
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   "source": [
    "# ----------------------------------------------------------------\n",
    "# Consider an array of non-negative integers.\n",
    "# A second array is formed by shuffling the elements of the first array and deleting a random element. \n",
    "# Given these two arrays, find which element is missing in the second array.\n",
    "# Here is an example input, the first array is shuffled and the number 5 is removed to construct the second array.\n",
    "# Input:\n",
    "# finder([1,2,3,4,5,6,7],[3,7,2,1,4,6])\n",
    "# Output:\n",
    "# 5 is the missing number\n",
    "# ----------------------------------------------------------------\n",
    "# Algorithm\n",
    "# \n",
    "# ----------------------------------------------------------------\n",
    "\n",
    "\n",
    "first_array = [1,2,3,4,5,6,7]\n",
    "second_array = [3,7,2,1,4,6]\n",
    "\n",
    "def finder(first_array, second_array):\n",
    "    return(sum(first_array) - sum(second_array))\n",
    "\n",
    "missing_number = finder(first_array, second_array)\n",
    "\n",
    "print(missing_number)    "
   ]
  }
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