IntegerInsertion

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

namespace IntegerInsertion
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> list1 = Console.ReadLine().Split(' ').Select(int.Parse).ToList();

            string input = Console.ReadLine();
            int x = 0;

            while (input != "end")
            {
                x = int.Parse(input);
                int firstDigit = GetFirstDigit(x);
                list1.Insert(firstDigit, x);
                input = Console.ReadLine();
            }
            for (int i = 0; i < list1.Count; i++)
            {
                Console.WriteLine(list1[i]);
            }
        }
        public static int GetFirstDigit(int input)
        {
            if (input < 10)
            {
                return input;
            }
            return GetFirstDigit((input - (input % 10)) / 10);
        }
    }
}