static void Main(string[] args)
{
var p1 = new Person("Almila", "EROL");
var s1 = new Student("Yunus", "EROL", "100");
var t1 = new Teacher("Yasemin", "UZUN", "Math");
p1.Intro();
s1.Intro();
t1.Intro();
t1.Teach();
}