use rand::Rng;
use std::env;

fn main() {
    if env::args().len() < 2 {
        panic!("Please, input a text!");
    }
    let args = env::args().collect::<Vec<String>>();
    let text = args[1..].join(" ");

    let x = text
        .split("")
        .map(|x| {
            let num = rand::thread_rng().gen_range(0..5);
            if num < 2 {
                x.to_uppercase()
            } else {
                x.to_lowercase()
            }
        })
        .collect::<Vec<_>>()
        .join("");

    println!("{}", x);
}