06. Equal Sum

using System;
using System.Linq;

namespace EqualSum
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] arr = Console.ReadLine().Split().Select(int.Parse).ToArray();
            bool isFound = false;
            for (int i = 0; i < arr.Length; i++)
            {
                int rightSum = 0;

                for (int r = i + 1; r < arr.Length; r++)
                {
                    rightSum += arr[r];
                }
                int leftSum = 0;

                for (int l = i - 1; l >= 0; l--)
                {
                    leftSum += arr[l];
                }

                if (rightSum == leftSum)
                {
                    Console.WriteLine(i);
                    isFound = true;
                    break;
                }
            }
            if (!isFound)
            {
                Console.WriteLine("no");
            }
        }
    }
}