08. Fuel Tank

#include <iostream>
#include <string>

using namespace std;

int main() {
    string fuel;
    cin >> fuel;

    double liters;
    cin >> liters;

    fuel[0] = tolower(fuel[0]);

    if (fuel == "diesel" || fuel == "gasoline" || fuel == "gas") {
        if (liters >= 25) {
            cout << "You have enough " << fuel << "." << endl;
        }
        else {
            cout << "Fill your tank with " << fuel << "!" << endl;
        }
    }
    else {
        cout << "Invalid fuel!" << endl;
    }

    return 0;
}