#include using namespace std; #define ll long long int main() { ll n, a, b; cin >> n >> a >> b; // cout << (char)('A' + ((n * (n + 1) - (n - a - 2) * (n - a + 1)) / 2 + b - 1)) << endl; cout << (char)('A' + (n * (n + 1) - (n - a + 2) * (n - a + 1) - 2 + 2 * b) / 2 % 26) << endl;

ll need = (n * (n + 1) - (n - a + 2) * (n - a + 1)) / 2 - 1 + b;
cout << (char)('A' + need % 26) << endl;

}