rot13

rot13.rs

use std::io::{self, BufRead};

fn rot13(s: &str) -> String {
    s.chars().map(|c| {
        if c.is_ascii_lowercase() {
            ((c as u8 - b'a' + 13) % 26 + b'a') as char
        } else if c.is_ascii_uppercase() {
            ((c as u8 - b'A' + 13) % 26 + b'A') as char
        } else {
            c
        }
    }).collect()
}

fn main() {
    let stdin = io::stdin();
    let stdin = stdin.lock();
    for line in stdin.lines() {
        let line = line.unwrap();
        println!("{}", rot13(&line));
    }
}