#include <iostream>
#include <cstdlib>

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