use std::{io,str::FromStr};

//1行の標準入力を型Tの値として返す
fn readline<T: FromStr>() -> T{
    let mut s = String::new();
    io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

#[allow(dead_code)]
fn read_delimiter<T: FromStr>(delimiter: &str) -> Vec<T>{
    let s = readline::<String>();
    s.split(delimiter).map(|e| e.parse().ok().unwrap()).collect::<Vec<T>>()
}

fn main() {
    let s = read_delimiter::<i32>(",");
    let mut n = 0;
    for i in s.iter(){
        n += i;
    }
    println!("a + b = {}",n);
}