#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define rrep(i, a, b) for(int i = a; i >= b; i--)
#define fore(i, a) for(auto &i:a)
#define print(x) cout << x << "\n"
#define SORT(a, n) sort(a, a+n);
#define REVERSE(a,n) reverse(a,a+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VREVERSE(v) reverse(v.begin(), v.end());
#define MOD 1000000007
#define yes "YES"
#define no "NO"
using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;

int main() {
    fastcin;
    int ha, hb, hc;
    char ans[3];
    cin >> ha >> hb >> hc;
    if(ha > hb) {
        if(ha > hc) {
            ans[0] = 'A';
            if(hb > hc) {
                ans[1] = 'B'; ans[2] = 'C';
            } else {
                ans[1] = 'C'; ans[2] = 'B';
            }
        }
        else {
            ans[0] = 'C'; ans[1] = 'A'; ans[2] = 'B';
        }
    } else {
        if(hb > hc) {
            ans[0] = 'B';
            if(ha > hc) {
                ans[1] = 'A'; ans[2] = 'C';
            } else {
                ans[1] = 'C'; ans[2] = 'A';
            }
        }
        else {
            ans[0] = 'C'; ans[1] = 'B'; ans[2] = 'A';
        }
    }
    rep(i, 0, 3) print(ans[i]);
    return 0;
}