Variant №13. 1-Masala

using System;
using System.Collections.Generic;
namespace m_ish_2
{
class Talaba
{
public decimal ID;
public string FIO;
public string Manzil;
public string Guruhi;
public uint OTM_ID;
}

class Program

{
static void Main(string[] args)
{
List F = new List();
F.Add(new Talaba { ID = 342211100454, FIO = "Maqsudova Feruza", Manzil = "farg'ona", Guruhi = "21.07", OTM_ID = 1 });
F.Add(new Talaba { ID = 342211100511, FIO = "Xolboyeva Mohigul", Manzil = "farg'ona", Guruhi = "21.09", OTM_ID = 2 });
F.Add(new Talaba { ID = 342211864513, FIO = "Farhodov Sherzod", Manzil = "Andijon", Guruhi = "18.55", OTM_ID = 3 });
F.Add(new Talaba { ID = 342242410451, FIO = "Ahmedova Fotima", Manzil = "Namangan", Guruhi = "18.17", OTM_ID = 4 });
F.Add(new Talaba { ID = 345422111045, FIO = "Rahmonberdiyev Umarali", Manzil = "Andijon", Guruhi = "19.08", OTM_ID = 5 });
F.Add(new Talaba { ID = 342211184610, FIO = "Farhodov Shermurod", Manzil = "Sirdaryo", Guruhi = "22.74", OTM_ID = 6 });
F.Add(new Talaba { ID = 342211156074, FIO = "Zokirov Abduvali", Manzil = "Andijon", Guruhi = "19.87", OTM_ID = 7 });
F.Add(new Talaba { ID = 342211745121, FIO = "Sobirova Mardona", Manzil = "Farg'ona", Guruhi = "18.69", OTM_ID = 8 });
F.Add(new Talaba { ID = 342211104512, FIO = "Muhammadjonov Ahror", Manzil = "Andijon", Guruhi = "19.88", OTM_ID = 9 });
F.Add(new Talaba { ID = 342211184514, FIO = "Mahmudova Surayyo", Manzil = "Buxoro", Guruhi = "21.82", OTM_ID = 10 });
F.Add(new Talaba { ID = 342211100456, FIO = "Farruh Komilov", Manzil = "Namangan", Guruhi = "21.03", OTM_ID = 11 });
var surov =
from a in F