fuck me

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

namespace fizzbuzz_but_length_me
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] numbers = { }; //Numbers to test against, in order. Will be filled in by user later. NO TOUCHING
            string[] words = { }; //Words to add to output if testing against numbers is true. Will be filled in by user later. NO TOUCHING
            int length;
            string input;
            string pattern = @"\b(?<number>\w+)[,]\s?(?<word>\w+)\b"; //This regex is used to grab the words and humbers from the user's input and put them in the arrays. ABSOLUTELY NO TOUCHING
            Regex regex = new Regex(pattern);

            while (true)
            {
                Console.Clear();
                for (int i = 0; i < numbers.Length; i++)
                {
                    Console.WriteLine("Set " + (i+1).ToString() + ": " + numbers[i].ToString() + ", " + words[i]);
                }
                Console.WriteLine("What number do you want to match multiples of, and what word do you want to replace it with?");
                Console.WriteLine("Format your input as [number to match], [word to replace with]");
                input = Console.ReadLine();
                MatchCollection matches = regex.Matches(input);
                Match matchesGroups = regex.Match(input);
                if (matches.Count == 0) { Console.WriteLine("Invalid input. Try again."); Console.ReadKey(); }
                else
                {
                    Group number = matchesGroups.Groups[1];
                    Array.Resize(ref numbers, numbers.Length + 1);
                    numbers[numbers.Length - 1] = Int32.Parse(number.ToString());
                    Group word = matchesGroups.Groups[2];
                    Array.Resize(ref words, words.Length + 1);
                    words[words.Length - 1] = word.ToString();

                    Console.WriteLine("Would you like to match against another number? y/n");
                    if(Console.ReadKey().Key == ConsoleKey.N) { Console.Clear(); break; }
                }

            }

            Console.WriteLine("Numbers to output up to?");
            length = Convert.ToInt32(Console.ReadLine());
            Console.Clear();

            for (int i = 1; i <= length; i++)
            {
                string output = "";

                for (int j = 0; j < numbers.Length; j++)
                {
                    if (i % (int)numbers.GetValue(j) == 0)
                    {
                        output = output + words.GetValue(j);
                    }
                }
                if (output == "") { output = i.ToString(); }

                Console.WriteLine(output);
            }
            Console.ReadKey();
        }
    }
}