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");