#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
#include <iomanip>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 
#define FOR_ITR( ARRAY , ITR , END ) for( auto ITR = ARRAY .begin() , END = ARRAY .end() ; ITR != END ; ITR ++ ) 

int main()
{

  CIN( ll , HA );
  CIN( ll , HB );
  CIN( ll , HC );
  const ll H[3] = { HA , HB , HC };
  const string S[3] = { "A" , "B" , "C" };

  for( uint i = 0 ; i < 6 ; i++ ){

    const ll a0 = i % 3;
    const ll a1 = ( a0 +( 1 + i / 3 ) ) % 3;
    const ll a2 = ( a1 +( 1 + i / 3 ) ) % 3;

    if( H[ a0 ] < H[ a1 ]  && H[ a1 ] < H[ a2 ] ){

      cout << S[ a2 ] << endl;
      cout << S[ a1 ] << endl;
      cout << S[ a0 ] << endl;
      return 0;

    }

  }

  return 0;

}