#include <iostream>
#include <stdio.h>
#include <cstring>
#include <math.h>
#include <algorithm>
#include <vector>
#include <string>
#include <stdlib.h>
#include <queue>
#include <stack>
#include <utility>
#define rep(i,n) for(int i=0;i<n;i++)
#define rrep(i,n) for(int i=n-1;i>=0;i--)
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define ll long long
#define INF 1000000001
#define mod 1000000007
using namespace std;

int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a>b&&b>c){
		cout<<"A"<<endl<<"B"<<endl<<"C"<<endl;
	}else if(a>c&&c>b){
		cout<<"A"<<endl<<"C"<<endl<<"B"<<endl;
	}else if(b>c&&c>a){
		cout<<"B"<<endl<<"C"<<endl<<"A"<<endl;
	}else if(b>a&&a>c){
		cout<<"B"<<endl<<"A"<<endl<<"C"<<endl;
	}else if(a>b){
		cout<<"C"<<endl<<"A"<<endl<<"B"<<endl;
	}else{
		cout<<"C"<<endl<<"B"<<endl<<"A"<<endl;
	}





	
}