Language: C++

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

namespace B___Palindromic_Numbers
{
    class Program
    {
        static void Main(string[] args)
        {
            int A = int.Parse(Console.ReadLine());
            int B = int.Parse(Console.ReadLine());
            int count = 0;

            for (int i = A; i <= B; ++i)
            {
                string s = i.ToString();

                System.Globalization.StringInfo si = new System.Globalization.StringInfo(s);

                string s1 = si.SubstringByTextElements(0, 1);

                string s2 = si.SubstringByTextElements(1, 1);

                string s4 = si.SubstringByTextElements(3, 1);

                string s5 = si.SubstringByTextElements(4, 1);

                if (s1 == s5 && s2 == s4)
                {
                    count += 1;
                }

                i = int.Parse(s);
            }

            Console.Write(count);
            Console.Read();
        }
    }
}

Compiler output:
a.cc:1:7: error: expected nested-name-specifier before 'System'
    1 | using System;
      |       ^~~~~~
a.cc:2:7: error: expected nested-name-specifier before 'System'
    2 | using System.Collections.Generic;
      |       ^~~~~~
a.cc:3:7: error: expected nested-name-specifier before 'System'
    3 | using System.Linq;
      |       ^~~~~~
a.cc:4:7: error: expected nested-name-specifier before 'System'
    4 | using System.Text;
      |       ^~~~~~
a.cc:5:7: error: expected nested-name-specifier before 'System'
    5 | using System.Threading.Tasks;
      |       ^~~~~~
a.cc:11:26: error: 'string' has not been declared
   11 |         static void Main(string[] args)
      |                          ^~~~~~
a.cc:11:35: error: expected ',' or '...' before 'args'
   11 |         static void Main(string[] args)
      |                                   ^~~~
a.cc:42:6: error: expected ';' after class definition
   42 |     }
      |      ^
      |      ;
a.cc: In static member function 'static void B___Palindromic_Numbers::Program::Main(int*)':
a.cc:13:21: error: expected primary-expression before 'int'
   13 |             int A = int.Parse(Console.ReadLine());
      |                     ^~~
a.cc:14:21: error: expected primary-expression before 'int'
   14 |             int B = int.Parse(Console.ReadLine());
      |                     ^~~
a.cc:19:17: error: 'string' was not declared in this scope
   19 |                 string s = i.ToString();
      |                 ^~~~~~
a.cc:21:17: error: 'System' was not declared in this scope
   21 |                 System.Globalization.StringInfo si = new System.Globalization.StringInfo(s);
      |                 ^~~~~~
a.cc:23:24: error: expected ';' before 's1'
   23 |                 string s1 = si.SubstringByTextElements(0, 1);
      |                        ^~
a.cc:25:24: error: expected ';' before 's2'
   25 |                 string s2 = si.SubstringByTextElements(1, 1);
      |                        ^~
a.cc:27:24: error: expected ';' before 's4'
   27 |                 string s4 = si.SubstringByTextElements(3, 1);
      |                        ^~
a.cc:29:24: error: expected ';' before 's5'
   29 |                 string s5 = si.SubstringByTextElements(4, 1);
      |                        ^~
a.cc:31:21: error: 's1' was not declared in this scope
   31 |                 if (s1 == s5 && s2 == s4)
      |                     ^~
a.cc:31:27: error: 's5' was not declared in this scope
   31 |                 if (s1 == s5 && s2 == s4)
      |                           ^~
a.cc:31:33: error: 's2' was not declared in this scope
   31 |                 if (s1 == s5 && s2 == s4)
      |                                 ^~
a.cc:31:39: error: 's4' was not declared in this scope
   31 |                 if (s1 == s5 && s2 == s4)
      |                                       ^~
a.cc:36:21: error: expected primary-expression before 'int'
   36 |                 i = int.Parse(s);
      |                     ^~~
a.cc:39:13: error: 'Console' was not declared in this scope
   39 |             Console.Write(count);
      |             ^~~~~~~