#include <iostream>

using namespace std;

int main() {

    char mode;
    cout << "Please choose mode (A/B/C): ";
    cin >> mode;

    switch(mode) {
    case 'A':
        cout << "Mode: " << mode << endl;
        break;
    case 'B':
        cout << "Mode: " << mode << endl;
        break;
    case 'C':
        cout << "Mode: " << mode << endl;
        break;
    default:
        cout << "Invalid mode!" << endl;
    }

}