using System;

using System.Collections.Generic;

​

public class Group

{

    string groupName;

    List<Student> Students;

    public string GroupName {get {return this.groupName;}}

    public void EditGroup(string groupName)

    {

        this.groupName = groupName;

    }

    public Group(string groupName)

    {

        this.Students = new List<Student>();

        this.groupName = groupName;

        Students = new List<Student>();

        this.Students.Add(new Student("Vasya","Pupkin"));

        this.Students.Add(new Student("Kolya","Pupko"));

        this.Students.Add(new Student("Ira","Supkova"));

    }

    public List<Student> this[string lastName]

    {

        get

        {

            List<Student> tempList = new List<Student>();

            string format = lastName.Substring(0,1).ToUpper() + lastName.Substring(1).ToLower();

            for(int i = 0; i < this.Students.Count; i++)

            {

                if(this.Students[i].LastName.Contains(format))

                    tempList.Add(Students[i]);

            }

            return tempList;

        }

    }

}

​

public class Student

{

    string firstName;

    string lastName;

    public string LastName {get {return this.lastName;}}

    public Student(string firstName, string lastName)

    {

        this.firstName = firstName;

        this.lastName  = lastName;

    }

    public override string ToString()

    {

        return string.Format("{0} {1}",this.firstName,this.lastName);

    }

}

​

public class Program

{

    public static void Main()

    {

        Group gr = new Group("Net 14-2");

        foreach(Student a in gr["pupk"])

            Console.WriteLine(a.ToString());

    }

}