fn main() {
    let mut input = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), &mut input).ok();
    let input: Vec<u64> = input
        .split_whitespace()
        .map(|n| n.parse().unwrap())
        .collect();

    let mut abc: Vec<_> = ['A', 'B', 'C'].into_iter().zip(&input[..]).collect();

    abc.sort_unstable_by_key(|&(_, h)| h);

    for &(p, _) in abc.iter().rev() {
        println!("{}", p);
    }
}