#include <iostream>
using namespace std;

int main(){
    int a, b, c; cin >> a >> b >> c;
    int A = 1;
    int B = 2;
    int C = 3;

    int temp;
    int bro;
    if(a > b){
        temp = a;
        a = b;
        b = temp;

        bro = A;
        A = B;
        B = bro;
    }
    if(b > c){
        temp = b;
        b = c;
        c = temp;

        bro = B;
        B = C;
        C = bro;
    }
    if(a > b) {
        temp = a;
        a = b;
        b = temp;

        bro = A;
        A = B;
        B = bro;
    }

    if(C == 1) cout << "A" << endl;
    else if(C == 2) cout << "B" <<endl;
    else if(C == 3) cout << "C" << endl;

    if(B == 1) cout << "A" << endl;
    else if(B == 2) cout << "B" <<endl;
    else if(B == 3) cout << "C" << endl;

    if(A == 1) cout << "A" << endl;
    else if(A == 2) cout << "B" <<endl;
    else if(A == 3) cout << "C" << endl;

    return 0;
}