zadacha petq

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

namespace ConsoleApp44
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int[] b = new int[n];
            for (int i = 0; i < n; i++)
            {
                b[i] = int.Parse(Console.ReadLine());
            }
            Console.WriteLine();
            for (int i = 0; i<n; i++)
                if (b[i] % 2 == 1 && i%2 == 0 && b[i] >9)
                {
                    Console.WriteLine((i+1) + " : " + b[i]);
                }

        }
    }
}