#include <iostream>
#include <vector>
using namespace std;
int main(){
    vector<int> v;
    for(int i = 0; i < 3; i++){
        int a;
        cin >> a;
        v.push_back(a);
    }  
    if(v[1] > v[0] && v[0] > v[2]){
        cout << "B" << endl;
        cout << "A" << endl;
        cout << "C" << endl;
    }
     if(v[2] > v[0] && v[0] > v[1]){
        cout << "C" << endl;
        cout << "A" << endl;
        cout << "B" << endl;
    }
     if(v[1] > v[2] && v[2] > v[0]){
        cout << "B" << endl;
        cout << "C" << endl;
        cout << "A" << endl;
    }
     if(v[0] > v[1] && v[1] > v[2]){
        cout << "A" << endl;
        cout << "B" << endl;
        cout << "C" << endl;
    }
     if(v[0] > v[2] && v[2] > v[1]){
        cout << "A" << endl;
        cout << "C" << endl;
        cout << "B" << endl;
    }
     if(v[2] > v[1] && v[1] > v[0]){
        cout << "C" << endl;
        cout << "B" << endl;
        cout << "A" << endl;
    }
return 0;
}