#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
int gcd(int a,int b){return b?gcd(b,a%b):a;}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int a,b,c;
    cin >> a >> b >> c;
    if(a<b){
        if(b<c){
            cout << "C" << endl;
            cout << "B" << endl;
            cout << "A" << endl;
        } else if(a<c){
            cout << "B" << endl;
            cout << "C" << endl;
            cout << "A" << endl;
        } else {
            cout << "B" << endl;
            cout << "A" << endl;
            cout << "C" << endl;
        }
    } else {
        if(a<c){
            cout << "C" << endl;
            cout << "A" << endl;
            cout << "B" << endl;
        } else if(b<c){
            cout << "A" << endl;
            cout << "C" << endl;
            cout << "B" << endl;
        } else {
            cout << "A" << endl;
            cout << "B" << endl;
            cout << "C" << endl;
        }
    }
    return 0;
}