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    "# ---------------------------------------------------------------\n",
    "# python best courses https://courses.tanpham.org/\n",
    "# ---------------------------------------------------------------\n",
    "# Check if a given key already exists in a dictionary\n",
    "# input\n",
    "# d = {1: 10, 2: 20, 3: 30, 4: 40, 5: 50, 6: 60}\n",
    "# is_key_present(5)\n",
    "# is_key_present(9)\n",
    "# output\n",
    "# Key is present in the dictionary                                                                              \n",
    "# Key is not present in the dictionary"
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