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Problem · String

Encrypt

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● EasyTeslaINTERNOA

Problem statement

A Caesar cipher encrypts a word by replacing each letter with another letter that is a fixed number of positions after it in the alphabet.

For example, for a cipher that replaces a letter with one that is four letters after it in the alphabet, letter A is replaced by E, letter B is replaced by F, ..., letter Y is replaced by C and letter Z is replaced by D. In other words, each letter in the alphabet is rotated to the right by four positions. For example: PINEAPPLE is encrypted as TMRIETTPI.

The table below shows the mapping of letters when using a Caesar cipher with a rotation of 4.

Write a function:

class Solution { public String encrypt(String text); }

that, given a string text, returns the string encrypted using a Caesar cipher with a rotation of 4.

Assume that:

The length of string text is within the range [1..100];
String text is made only of uppercase letters (A-Z).

In your solution, focus on correctness. The performance of your solution will not be the focus of the assessment.

Function

encrypt(text: String) → String

Examples

Example 1

text = "PINEAPPLE"return = "TMRIETTPI"

Example 2

text = "ZEBRA"return = "DIFVE"

Example 3

text = "NETWORK"return = "RIXASVO"