#include <iostream>
#define A cout << 'A' << '\n'
#define B cout << 'B' << '\n'
#define C cout << 'C' << '\n'
using namespace std;

int main()
{
    int ha,hb,hc;
    cin >> ha >> hb >> hc;

    if(ha > hb && ha > hc){
        A;
        if(hb > hc){
            B;
            C;
        }else{
            C;
            B;
        }
    }else if(hb > ha && hb > hc){
        B;
        if(ha > hc){
            A;
            C;
        }else{
            C;
            A;
        }
    }else{
        C;
        if(ha > hb){
            A;
            B;
        }else{
            B;
            A;
        }
    }

    return 0;
}