using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication32
{
    public class Program
    {
        static void Main(string[] args)
        {
            Journal StudentsBase = new Journal();

            Console.WriteLine("Введите имя студента: ");
            string firstname = Console.ReadLine();
            Console.WriteLine("Введите фамилию: ");
            string lastname = Console.ReadLine();

            StudentsBase.Addstudent(firstname, lastname);
            Console.WriteLine("кого искать?");
            string name = Console.ReadLine();
            Student x = StudentsBase.Search(name);
            if (x != null)
                Console.WriteLine(x.Firstname);
            else
                Console.WriteLine("Поиск не дал результата");
        }
    }

    class Journal
    {
        private List<Student> students = new List<Student>();

        public void Addstudent(string studentFname, string studentLname)
        {
            Student student = new Student();

            student.Firstname = studentFname;
            student.Lastname = studentLname;
            students.Add(student);
        }

        public Student Search(string searchfirstname)
        {
            foreach (Student i in students)
                if (i.Firstname == searchfirstname)
                    return i;
            return null;
        }
    }

    public class Student
    {
       public string Firstname;
       public string Lastname;
    }
}