How to extract characters from text file

Question

I want to extract all characters from text file for create subset font. How I can extract and sort characters?

Example:

input "Hello, Harry. 안녕? 잘 지내니? おはよう。どうもありがとう。"

↓

output " ,.?Haelory。あうおがとどはもより내녕니안잘지"

Answer 1

In JavaScript, that would be:

let input = "Hello, Harry. 안녕? 잘 지내니? おはよう。どうもありがとう。";
let output = [...new Set(Array.from(input))].sort().join('');
// -> " ,.?Haelory。あうおがとどはもより내녕니안잘지"