/* -*- coding: utf-8 -*-
 *
 * 571.cc: No.571 3人兄弟(その2) - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int N = 3;

/* typedef */

struct Stat {
  int h, w, i;
  Stat() {}
  Stat(int _h, int _w, int _i): h(_h), w(_w), i(_i) {}
  bool operator<(const Stat &s) const {
    return h > s.h || (h == s.h && w < s.w);
  }
};

/* global variables */

Stat hws[N];

/* subroutines */

/* main */

int main() {
  for (int i = 0; i < N; i++) {
    int hi, wi;
    scanf("%d%d", &hi, &wi);
    hws[i] = Stat(hi, wi, i);
  }
  sort(hws, hws + N);

  for (int i = 0; i < N; i++) printf("%c\n", 'A' + hws[i].i);
  return 0;
}