Equal_Sums

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Equal_Sums
{
    class Equal_Sums
    {
        static void Main(string[] args)
        {
            string[] input = Console.ReadLine().Split();
            int[] numbers = new int[input.Length];
            for (int i = 0; i < input.Length; i++)
            {
                numbers[i] = int.Parse(input[i]);
            }
            for (int i = 0; i < input.Length; i++)
            {
                long leftSum = 0;
                long rightSum = 0;
                for (int j = 0; j < i; j++)
                {
                    leftSum += numbers[j];
                }
                for (int j = i + 1; j < numbers.Length; j++)
                {
                    rightSum += numbers[j];
                }
                if (leftSum == rightSum)
                {
                    Console.WriteLine(i);
                    return;
                }
            }
            Console.WriteLine("no");
        }
    }
}