use std::{io::{Read, stdin}, process::exit};

use brainrust::*;

fn main() {
    let mut str = String::new();
    stdin().read_to_string(&mut str).unwrap();
    
    let eval_res = eval(&str.as_str());
    if eval_res.is_err() {
        let err = eval_res.unwrap_err();
        if err == "Stdin closed" {
            exit(0);
        }
        eprintln!("Program failed: {}", err);
    }
}