#[allow(unused_macros)]
macro_rules! read_line_to_tuple {
    ( $( $t:ty ),* ) => {{
        let mut input = String::new();
        std::io::stdin().read_line(&mut input).unwrap();
        let mut iter = input.split_whitespace();
        ( $( iter.next().unwrap().parse::<$t>().unwrap() ),* )
    }};
}

#[allow(unused_macros)]
macro_rules! read_line_to_collection {
    ( $t:ty ) => {{
        let mut input = String::new();
        std::io::stdin().read_line(&mut input).unwrap();
        let iter = input.split_whitespace();
        iter.map(|x| x.parse().unwrap()).collect::<$t>()
    }};
}

fn solve() -> String {
    let (mut a, b) = read_line_to_tuple!(i64, i64);

    let mut ans = Vec::new();
    let mut p = 1;
    while a != b {
        while a % (p << 1) == 0 && a + (p << 1) <= b { p <<= 1; }
        while a + p > b { p >>= 1; }
        a += p;
        ans.push(p.to_string());
    }

    format!("{}\n{}", ans.len(), ans.join(" "))
}

fn main() {
    let t = read_line_to_tuple!(usize);
    let answers = (0..t).map(|_| solve()).collect::<Vec<_>>();
    println!("{}", answers.join("\n"));
}