#include <stdio.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <map>

int main(){
    std::vector<std::pair<int,char> > heights(3);

    int input;
    std::cin >> input;
    heights[0]=std::make_pair(input,'A');
    std::cin >> input;
    heights[1]=std::make_pair(input,'B');
    std::cin >> input;
    heights[2]=std::make_pair(input,'C');
    
    std::sort(heights.begin(),heights.end());
    
    std::cout << heights[2].second << std::endl;
    std::cout << heights[1].second << std::endl;
    std::cout << heights[0].second << std::endl;

}