fn main() {
    let stdin = std::io::read_to_string(std::io::stdin()).unwrap();
    let mut stdin = stdin.split_ascii_whitespace();

    let a: u16 = stdin.next().unwrap().parse().unwrap();
    let b: u16 = stdin.next().unwrap().parse().unwrap();

    println!("{}", output(solve(a, b)));
}

fn solve(a: u16, b: u16) -> (bool, u16) {
    (a < b, (a + 1).abs_diff(b))
}

fn output(ans: (bool, u16)) -> String {
    match ans {
        (true, ans) => String::from("YES\n") + &ans.to_string(),
        (false, ans) => String::from("NO\n") + &ans.to_string(),
    }
}