package net.ipipip0129.yukicoder.no570;

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        List<Human> humanList = new ArrayList<>();
        final String[] names = new String[] {"A", "B", "C"};

        for (int i = 0; i < 3; i++) humanList.add(new Human(names[i], Integer.parseInt(scan.nextLine())));

        Collections.sort(humanList, new HumanComparator());

        humanList.stream().forEach(i -> System.out.println(i.getName()));
    }
}

class Human {
    private String name;
    private int height;

    public Human(String name, int height) {
        this.name = name;
        this.height = height;
    }

    public String getName() {
        return name;
    }

    public int getHeight() {
        return height;
    }
}

class HumanComparator implements Comparator<Human> {
    @Override
    public int compare(Human o1, Human o2) {
        if (o1.getHeight() < o2.getHeight()) {
            return 1;
        } else {
            return -1;
        }
    }
}