ROT13

ROT13, short for rotate by 13 places, is a simple substitution cipher derived from the Caesar cipher. It works by replacing each letter in the English alphabet with the letter 13 positions after it, wrapping around to the beginning of the alphabet if necessary.

• For uppercase letters: A becomes N, B becomes O, ..., Z becomes M.
• For lowercase letters: a becomes n, b becomes o, ..., z becomes m.
• Non-alphabetic characters (digits, punctuation, spaces) remain unchanged.

Here's a simple table that illustrates each letter substitution with ROT13:

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm

Print the encoded or decoded ROT13 sequence for each argument, each on their own line.

External links: Wikipedia