using System;

​

public class Program

{

    public static void Main()

    {

        int x, y;

        int[] num = new int[10]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

        Console.Write("index: ");

        x = Convert.ToInt32(Console.ReadLine());

        for (int i = 0; i < 10; i++)

        {

            if (num[i] == x)

            {

                Console.Write("value: ");

                y = Convert.ToInt32(Console.ReadLine());

                num[i] = y;

            }

​

            Console.Write(num[i] + ", ");

        }

    }

}