123

using System;
using System.Collections.Generic;
using System.Linq;

namespace HW
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> list = Console.ReadLine().Split(' ').Select(int.Parse).ToList();
            List<int> secondHalf = new List<int>(list.Count / 2);
            int tenths, digit, index = 0;
            for (int i = list.Count / 2; i < list.Count; i++)
            {
                secondHalf.Add(list[i]);
                list.RemoveAt(i); i--;
            }
            //foreach (int number in secondHalf) list.Remove(number);
            //list = list.Take(list.Count / 2).ToList(); //
            foreach (int number in secondHalf)
            {
                tenths = number / 10;
                digit = number % 10;
                list.Insert(index, tenths);
                index += 2;
                list.Insert(index, digit);
                index++;
            }
            Console.WriteLine(string.Join(" ", list));
            Console.ReadLine();
        }
    }
}