using System;

public class Program

{       

    public static void Main()

    {

        int[] arr =new int[8]{1,3,4,5,8,2,3,4};

        int[] arr2 =new int[9];

        int cnt =0;

        Random x =new Random();

        for(int i=0; i<arr2.Length; i++)

        {

            int num = x.Next(1,9);

            arr2[i] =num;

        }

            for(int y =0; y<arr2.Length; y++)

            {

                Console.Write( arr2[y]);

            }

            for(int j =0; j<arr.Length; j++)

            {

                for(int o =0; o<arr2.Length; o++)

                {

                    if(arr[j] ==arr2[o])

                    {

                        cnt++;

                    }

                }

                if(cnt!=0)

                {

                    Console.WriteLine(arr[j]);

            }

            }

    }

    }

​