#include<bits/stdc++.h>
using namespace std;
#define lo long long
#define sr string
#define ch char
#define ve vector
#define al(x) x.begin(),x.end()
#define sort(x) sort(x.begin(),x.end())
#define reverse(x) reverse(x.begin(),x.end())
#define rep(i,a) for(lo i=0;i<a;i++)
#define lep(i,a) for(lo i=0;i<=a;i++)
#define rrep(i,a,b) for(lo i=a;i<b;i++)
#define rrrep(i,a,b) for(lo i=a;i>=b;i--)
#define wh while

int main(){
    lo A,B,C;
    cin>>A>>B>>C;
    if(max(max(A,B),C)==A){
        cout<<'A'<<endl;
        if(max(B,C)==B){
            cout<<'B'<<endl<<'C'<<endl;
        }
        else{
            cout<<'C'<<endl<<'B'<<endl;
        }
    }
     else if(max(max(A,B),C)==B){
        cout<<'B'<<endl;
        if(max(A,C)==A){
            cout<<'A'<<endl<<'C'<<endl;
        }
        else{
            cout<<'C'<<endl<<'A'<<endl;
        }
    }
     else if(max(max(A,B),C)==C){
        cout<<'C'<<endl;
        if(max(B,A)==B){
            cout<<'B'<<endl<<'A'<<endl;
        }
        else{
            cout<<'A'<<endl<<'B'<<endl;
        }
    }
}