01. Messaging

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

namespace Messaging
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> numbers = Console.ReadLine()
                .Split(' ', StringSplitOptions.RemoveEmptyEntries)
                .ToList();
            int[] output = new int[numbers.Count];

            for (int i = 0; i < numbers.Count; i++)
            {
                int sum = 0;
                int current = int.Parse(numbers[i]);

                for (int j = 0; j < numbers[i].Length; j++)
                {
                    sum += current % 10;
                    current /= 10;
                }
                output[i] = sum;
            }

            string text = Console.ReadLine();

            for (int i = 0; i < output.Length; i++)
            {

                while (output[i] >= text.Length)
                {
                    output[i] -= text.Length;
                }

                Console.Write($"{text[output[i] + i]}");
            }
        }
    }
}