import java.awt.image.IndexColorModel;
import java.util.*;
import java.util.stream.Collector;
import java.util.stream.*;

public class Main {

    public static class Data implements Comparable<Data> {
        char ID;
        int he;
        int we;
        Data(char a, int b, int c) {
            ID = a;
            he = b;
            we = c;
        }

        public int compareTo(Data o) {
            if(o.he == this.he) return -o.we + this.we;
            return -this.he + o.he;
        }
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Data[] d = new Data[3];
        for(int i = 0; i < 3; i++) {
            d[i] = new Data((char)('A' + i),sc.nextInt(),sc.nextInt());
        }
        Arrays.sort(d);
        for(int i = 0; i < 3; i++) {
            System.out.println(d[i].ID);
        }


    }
}