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    "# ---------------------------------------------------------------\n",
    "# python best courses https://courses.tanpham.org/\n",
    "# ---------------------------------------------------------------\n",
    "# Write a Python program to create a Caesar encryption\n",
    "\n",
    "# Note : In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques.\n",
    "# It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.\n",
    "# For example, with a left shift of 3, D would be replaced by A, E would become B, and so on.\n",
    "# The method is named after Julius Caesar, who used it in his private correspondence.\n",
    "\n",
    "# plaintext:  defend the east wall of the castle\n",
    "# ciphertext: efgfoe uif fbtu xbmm pg uif dbtumf"
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