Common Prefix.ipynb

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      "upgrad\n",
      "upgradschhgh\n",
      "upgra\n"
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   "source": [
    "string1=input()\n",
    "string2=input()\n",
    "\n",
    "#start writing your code to find largest common prefix here\n",
    "string1 = string1.lower()\n",
    "string2 = string2.lower()\n",
    "l1 = len(string1)\n",
    "l2 = len(string2)\n",
    "min_len = min(l1,l2)\n",
    "# print(min_len)\n",
    "for i in range(min_len):\n",
    "    if string1[i] != string2[i]:\n",
    "        break\n",
    "if i == 0:\n",
    "    print(-1)\n",
    "else:\n",
    "    print(string2[:i])"
   ]
  }
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