using System;

using System.Collections.Generic;

public class Program

{

     static void FindTwoSum(List<int> list, int sum){

        int len = list.Count;

        for(int i=0 ;i<len;i++){

            for(int j=i+1;j<len;j++){

                if(list[i]+list[j] == sum){

                     Console.WriteLine("{" + list[i] + ", " + list[j] + "}");

                }

            }

        }

    }

    public static void Main()

    {

        var list = new List<int>() { 3, 1, 5, 7, 5, 9 };

         int sum = 8;

        FindTwoSum(list, sum);

    }

}