import java.util.Arrays;
import java.util.Scanner;
class Brother {
	int cm;
	int kg;
	String name;

	public Brother(int cm, int kg ,String name) {
		this.cm = cm;
		this.kg = kg;
		this.name = name;
	}
}
class paiza {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		Brother[] brother = new Brother[3];
		boolean check = false;
		Brother tmp;
		//Brother[] sort = new Brother[3];
		String[] index = {"A","B","C"};

		for (int i = 0; i < 3; i++) {
			brother[i] = new Brother(sc.nextInt(),sc.nextInt(),index[i]);
		}

		do {
			check = false;
			if (brother[0].cm == brother[1].cm) {
				if(brother[0].kg > brother[1].kg) {
					tmp = brother[0];
					brother[0] = brother[1];
					brother[1] = tmp;
					check = true;
				}
			}
			
			if (brother[1].cm == brother[2].cm) {
				if(brother[1].kg > brother[2].kg) {
					tmp = brother[1];
					brother[1] = brother[2];
					brother[2] = tmp;
					check = true;
				}
			}
			
			if (brother[0].cm == brother[2].cm) {
				if(brother[0].kg > brother[2].kg) {
					tmp = brother[2];
					brother[2] = brother[0];
					brother[0] = tmp;
					check = true;
				}
			}
		} while (check);

		Arrays.sort( brother, (a,b)-> b.cm - a.cm ); 

		for(int i = 0; i < brother.length; i++) {
			System.out.println(brother[i].name);
		}
	}
}