#include <iostream>
#include <string>

using namespace std;

int max2(int x, int y) {
    return x > y ? x : y;
}

int max3(int x, int y, int z) {
    x = max2(x, y);
    return max2(x, z);
}

int min2(int x, int y) {
    return x < y ? x : y;
}

int min3(int x, int y, int z) {
    x = min2(x, y);
    return min2(x, z);
}

int main() {
    int a, b, c;
    cin >> a;
    cin >> b;
    cin >> c;

    int heighest = max3(a, b, c);
    int shortest = min3(a, b, c);;

    cout << (heighest == a ? "A" : (heighest == b ? "B" : "C")) << "\n";
    cout << ((heighest != a && shortest != a) ? "A" : ((heighest != b && shortest != b) ? "B" : "C")) << "\n";
    cout << (shortest == a ? "A" : (shortest == b ? "B" : "C")) << "\n";

    cin >> a;

    return 0;
}