#include <cmath>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <functional>
#include <queue>
#include <iostream>
#include <string.h>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <cstdint>
#include <climits>
#include <unordered_set>
#include <sstream>
#include <stack>

using namespace std;

typedef long long int ll;
typedef pair<ll,ll> pii;
typedef tuple<ll,ll,ll> t3;

using namespace std;


int main() {
    int a,b,c;
    cin >> a >> b >> c;
    vector<pair<int, string>> p;
    p.emplace_back(a,"A");
    p.emplace_back(b,"B");
    p.emplace_back(c,"C");
    sort(p.begin(), p.end(), std::greater<pair<int, string>>());
    for(auto e: p)
    {
        cout << e.second << endl;
    }
    return 0;
}