#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;

int main(){
    int HA,HB,HC,WA,WB,WC;
    bool ab,bc,ca;
    cin >> HA >> WA >> HB >> WB >> HC >> WC;
    if(HA>=HB){
        if(HA==HB&&WA<WB)   ab = false;
        else ab = true;
    }
    else ab = false;

    if(HB>=HC){
        if(HB==HC&&WB<WC)   bc = false;
        else bc = true;
    }
    else bc = false;

    if(HC>=HA){
        if(HC==HA&&WC<WA)   ca = false;
        else ca = true;
    }
    else ca = false;

    if(!ca&&ab){
         cout << 'A' << endl;
         if(bc) cout << "B\nC\n";
         else cout << "C\nB\n";
    }
    else if(!ab&&bc){
         cout << 'B' << endl;
         if(ca) cout << "C\nA\n";
         else cout << "A\nC\n";
    }
    else{
         cout << 'C' << endl;
         if(ab) cout << "A\nB\n";
         else cout << "B\nA\n";
    }
    return 0;
}