Zipper stuck

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

namespace stuck_zipper
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> firstList = Console.ReadLine().Split(' ').Select(int.Parse).ToList();
            List<int> secondList = Console.ReadLine().Split(' ').Select(int.Parse).ToList();
            int minValue = Math.Min(Math.Abs(firstList.Min()), Math.Abs(secondList.Min()));
            int minDigitCount = 0;
            while (minValue > 0)
            {
                minValue = minValue / 10;
                minDigitCount++;
            }
            for (int i = 0; i < firstList.Count; i++)
            {
                int digitCount = 0;
                int currentElement = firstList[i];
                while (currentElement > 0)
                {
                    currentElement = currentElement / 10;
                    digitCount++;
                }
                if (digitCount > minDigitCount)
                {
                    firstList.RemoveAt(i);
                    i--;
                }
            }
            for (int i = 0; i < secondList.Count; i++)
            {
                int digitCount = 0;
                int currentElement = secondList[i];
                while (currentElement > 0)
                {
                    currentElement = currentElement / 10;
                    digitCount++;
                }
                if (digitCount > minDigitCount)
                {
                    secondList.RemoveAt(i);
                    i--;
                }
            }
            int count = 1;
            for (int i = 0; i < firstList.Count; i++)
            {
                if (i + count <= secondList.Count)
                {
                    secondList.Insert(i + count, firstList[i]);
                    count++;
                }
                else if (i + count > secondList.Count)
                {
                    secondList.Add(firstList[i]);

                }
            }
            Console.WriteLine(string.Join(" ", secondList));
        }
    }
}