using System;

public class Program

{

    public static void Main()

    {

        char sex;

        do{

            Console.WriteLine("Enter your sex [F/M]");

            sex = char.Parse(Console.ReadLine());

        }while(sex != 'F' && sex != 'M');

        if (sex == 'F'){

            Console.WriteLine("You are Female");

        }

        if (sex == 'M'){

            Console.WriteLine("You are Male");

        }

    }

}