import java.util.Scanner;

public class Converter {

    @SuppressWarnings("null")
    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);

        System.out.println("Welcome to the Fahrenheit/Celsius Converter!");
        System.out.println("To convert, type in your temperature and the identify if you are using fahrenheit or celsius.");
        System.out.println("Example: 69F or 69C F = Fahrenheit C = Celsius");

        String temperature = null;
        char f = 0, c;
        double answer , temp;

        temp = keyboard.nextDouble();

        if (temperature.contains("F")) {
            String StringVariable = null;
            StringVariable.replace(f , ' ');
            answer = temp - 30 / 2;
            System.out.println("Poof! The temperature is " + answer + "C");
        } else {
            System.out.println("You entered the temperature wrong!");


            }
    }

}