package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
	"strings"
)

var sc = bufio.NewScanner(os.Stdin)

func nextInt() int {
	sc.Scan()
	i, err := strconv.Atoi(sc.Text())
	if err != nil {
		panic(err)
	}
	return i
}

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

// Person ...
type Person struct {
	H    int
	W    int
	Name string
}

// People ...
type People []Person

func (a People) Len() int      { return len(a) }
func (a People) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a People) Less(i, j int) bool {
	if a[i].H == a[j].H {
		return a[i].W < a[j].W
	}
	return a[i].H > a[j].H
}

func main() {
	var vs People
	alphas := []string{"A", "B", "C"}
	for i := 0; i < 3; i++ {
		c := strings.Split(nextLine(), " ")
		x, _ := strconv.Atoi(c[0])
		y, _ := strconv.Atoi(c[1])
		vs = append(vs, Person{
			H:    x,
			W:    y,
			Name: alphas[i],
		})
	}
	sort.Sort(People(vs))
	for _, p := range vs {
		fmt.Println(p.Name)
	}
}