//{{{
#include <bits/stdc++.h>
using namespace std;
#define rep(...) repN((__VA_ARGS__,rep3,rep2,loop,~))(__VA_ARGS__)
#define loop(n) rep2(_loop_,n)
#define rep2(i,n) rep3(i,0,n)
#define rep3(i,begin,end) for(int i=(int)(begin),i##_end=(int)(end);i<i##_end;++i)
#define repN(a) repX a
#define repX(a0,a1,a2,x,...) x
typedef long long ll;
const int MOD = 1e9+7;
//}}}

int main(){
	map<pair<int, int>, char> mp;
	int h, w;
	cin >> h >> w;
	mp[make_pair(200-h, w)] = 'A';
	cin >> h >> w;
	mp[make_pair(200-h, w)] = 'B';
	cin >> h >> w;
	mp[make_pair(200-h, w)] = 'C';
	for(auto x: mp){
		cout << x.second << endl;
	}
	return 0;
}