#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<map>
#define all(x) x.begin(),x.end()
#define pb push_back
#define ll long long 
#define P pair<int,int>
#define LP pair<ll,ll>
using namespace std;
int main() {
	int a, b, c;
	map < int,char> g;
	int ma=0;
	cin >> a>>b>>c;
	g[a] = 'A';
	g[b] = 'B';
	g[c] = 'C';
	int mi = a;
	ma = max(ma, max(a, max(b, c)));
	mi = min(mi, min(b, c));

	cout << g[ma] << endl;
	cout << g[a + b + c - ma - mi] << endl;
	cout << g[mi] << endl;
	return 0;
}