import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

public class Main {
	static public void main(String[]args) throws Exception {
		Scanner sc = new Scanner(System.in);
		final int NUM = 3;
		List<Person> list = new ArrayList<>();

		for(int i=0; i < NUM; i++) {
			int h = sc.nextInt();
			int w = sc.nextInt();
			char c = (char) ('A' + i);
			String name = String.valueOf(c);
			list.add(new Person(name, h, w));
		}
		Collections.sort(list, new PersonComparator());
		for(int i=0; i < NUM; i++) {
			System.out.println(list.get(i).getName());
		}
	}
}

class Person {
	private String name;
	private int heigth;
	private int weight;

	private Person() {

	}

	public Person(String name, int heigth, int weight) {
		this.name = name;
		this.heigth = heigth;
		this.weight = weight;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getHeigth() {
		return heigth;
	}

	public void setHeigth(int heigth) {
		this.heigth = heigth;
	}

	public int getWeight() {
		return weight;
	}

	public void setWeight(int weight) {
		this.weight = weight;
	}
}

class PersonComparator implements Comparator<Person> {

	@Override
	public int compare(Person p1, Person p2) {
		int dh = p1.getHeigth() - p2.getHeigth();
		if(dh != 0) {
			return -dh;
		} else {
			int dw = p1.getWeight() - p2.getWeight();
			return dw;
		}
	}

}