int number;
    while(cin >> number && number != 0) {
        if(number % 11 == 0) {
            cout << number << " is a multiple of 11." << endl;
        } else {
            cout << number << " is not a multiple of 11." << endl;
        }
    }
    cout << number << " is not a multiple of 11." << endl;
    return 0;