using System;

namespace _4._6
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] mas = new int[] { 1, 2, 3, 4, 5, 6, 7 };
            a(ref mas);
        }
        static int a(ref int[] b)
        {
            bool vhod = true;
            int[] count = new int[b.Length];
            int[] rememeber = new int[b.Length];
            for (int i = 0; i < b.Length; i++)
            {
                rememeber[i] = b[i];
            }
            Random random = new Random();
            int r1 = random.Next(1, b.Length);
            for (int i = 0; i < b.Length; i++)
            {
                for (int l = 0; l < i; l++)
                {
                    vhod = true;
                    if (count[l] == r1)
                    {
                        i -= 1;
                        vhod = false;
                        continue;
                    }
                }
                if (vhod == true)
                {
                    b[i] = rememeber[r1];
                    count[i] = r1;
                }
            }
            for (int i = 0; i < b.Length; i++)
            {
                Console.WriteLine(b[i]);
            }
            return b[1];
        }
    }
}