import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static class Person implements Comparable<Person> {
		String name;
		int height, weight;
		
		public Person(String name, int height, int weight){
			this.name = name;
			this.height = height;
			this.weight = weight;
		}
		
		@Override
		public int compareTo(Person arg0){
			if(Integer.compare(this.height, arg0.height) != 0){
				return -Integer.compare(this.height, arg0.height);
			}else{
				return Integer.compare(this.weight, arg0.weight);
			}
		}
		
		@Override
		public String toString(){
			return this.name;
		}
	}
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		Person[] people = new Person[3];
		people[0] = new Person("A", sc.nextInt(), sc.nextInt());
		people[1] = new Person("B", sc.nextInt(), sc.nextInt());
		people[2] = new Person("C", sc.nextInt(), sc.nextInt());
		
		Arrays.sort(people);
		
		for(final Person p : people){
			System.out.println(p);
		}
	}
}