Gender greeting

package gendergreeting;
import java.util.Scanner;
public class GenderGreeting {

    public static void main(String[] args) {
                Scanner input = new Scanner(System.in);

        System.out.print("Enter your gender (m/f): ");
        char gender = input.next().charAt(0);

        if (gender == 'm' || gender == 'M') {
            System.out.println("Hello Sir");
        } else if (gender == 'f' || gender == 'F') {
            System.out.println("Hello Madam");
        } else {
            System.out.println("Invalid input");
        }
    }
}