Messaging

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

namespace Messaging
{
    class Program
    {
        static void Main()
        {
            List<int> numbers = Console.ReadLine()
                .Split()
                .Select(int.Parse)
                .ToList();

            string text = Console.ReadLine();
            List<char> textSplit = text.ToList();

            List<char> textToPrint = new List<char>();
            SumNumbersInList(numbers);

            for (int i = 0; i < numbers.Count; i++)
            {
                int indexToRemove = IndexToRemove(textSplit.Count, numbers[i]);
                textToPrint.Add(textSplit[indexToRemove]);
                textSplit.RemoveAt(indexToRemove);
                //count++;
            }


            Console.WriteLine(string.Join("", textToPrint));

        }

        static void SumNumbersInList(List<int> numbers)
        {

            for (int i = 0; i < numbers.Count; i++)
            {
                int sumDigits = 0;
                while (numbers[i] != 0)
                {
                    sumDigits += numbers[i] % 10;
                    numbers[i] /= 10;
                }

                numbers[i] = sumDigits;

            }
        }

        static int IndexToRemove(int textLength, int index)
        {
            if (textLength > index)
                return index;

            else if (textLength == index)
                return 0;

            else
            {
                int timesInIndex = index / textLength;

                return index - (timesInIndex * textLength);
            }
        }
    }
}