# Rotational Cipher

Easy

1

16.7% Acceptance

Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.

The Caesar cipher is a simple shift cipher that relies on

transposing all the letters in the alphabet using an integer key

between `0`

and `26`

. Using a key of `0`

or `26`

will always yield

the same output due to modular arithmetic. The letter is shifted

for as many values as the value of the key.

The general notation for rotational ciphers is `ROT + <key>`

.

The most commonly used rotational cipher is `ROT13`

.

A `ROT13`

on the Latin alphabet would be as follows:

`Plain: abcdefghijklmnopqrstuvwxyz Cipher: nopqrstuvwxyzabcdefghijklm`

It is stronger than the Atbash cipher because it has 27 possible keys, and 25 usable keys.

Ciphertext is written out in the same formatting as the input including spaces and punctuation.

## Examples

- ROT5
`omg`

gives`trl`

- ROT0
`c`

gives`c`

- ROT26
`Cool`

gives`Cool`

- ROT13
`The quick brown fox jumps over the lazy dog.`

gives`Gur dhvpx oebja sbk whzcf bire gur ynml qbt.`

- ROT13
`Gur dhvpx oebja sbk whzcf bire gur ynml qbt.`

gives`The quick brown fox jumps over the lazy dog.`