#include<cstdio>
#include<cstdlib>
#include<algorithm>
#include<iostream>
#include<queue>
#include<vector>
#include <bitset>
#include <cmath>
#include <limits>
#include <iostream>
using namespace std;
#define INF 100000
#define MAX 100000
#define MOD 1000000007
typedef long long ll;
typedef pair<int,int> P;
typedef pair< pair<int,int>, int> p; 
#define bit(n,k) ((n>>k)&1) /*nのk bit目*/
#define rad_to_deg(rad) (((rad)/2/M_PI)*360)

int main(){
    P a[3];
    for(int i=0;i<3;i++){
        cin>>a[i].first;
        a[i].second=i;
    }
    sort(a,a+3,greater<P>());
    for(int i=0;i<3;i++){
        if(a[i].second==0) cout<<"A"<<endl;
        else if(a[i].second==1) cout<<"B"<<endl;
        else cout<<"C"<<endl;
    }
}