fn main() {
    let mut hw: Vec<(&str, usize, usize)> = vec![];
    for i in 0..3 {
        let mut hw1 = String::new();
        std::io::stdin().read_line(&mut hw1).ok();
        let hw1: Vec<usize> = hw1.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        hw.push((if i==0 { "A" } else if i==1 { "B" } else { "C" }, hw1[0], hw1[1]));
    }

    hw.sort_by_key(|s| s.2);
    hw.reverse();
    hw.sort_by_key(|s| s.1);
    hw.reverse();
    hw.iter().for_each(|tri| {
        println!("{}", tri.0);
    });
}