05. Students 2.0

using System;
using System.Collections.Generic;
using System.Linq;

namespace Students
{
    public class StartUp
    {
        public static void main(string[] args)
        {

        }
    }

    class Student
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int Age { get; set; }
        public string City { get; set; }

        public static void Main()
        {
            List<Student> students = new List<Student>();

            string line = Console.ReadLine();

            while (line != "end")
            {
                string[] token = line.Split();

                string firstname = token[0];
                string lastName = token[1];
                int age = int.Parse(token[2]);
                string city = token[3];

                Student student = new Student()
                {
                    FirstName = firstname,
                    LastName = lastName,
                    Age = age,
                    City = city
                };

                for (int i = 0; i < students.Count; i++)
                {
                    if (students[i].FirstName == token[0] && students[i].LastName == token[1])
                    {
                        students.RemoveAt(i);
                        students.Append(student);
                    }
                }

                students.Add(student);
                line = Console.ReadLine();
            }
            string filterCity = Console.ReadLine();

            foreach (Student student in students)
            {
                if (student.City == filterCity)
                {
                    Console.WriteLine($"{student.FirstName} {student.LastName} is {student.Age} years old.");
                }
            }
        }
    }
}