lexicography

using System;
//Write a program that compares two char arrays lexicographically (letter by letter).

class LexicographicallyCompares
{
    static void Main()
    {
        // Input

        string firstString = Console.ReadLine();
        string secondString = Console.ReadLine();

        char[] firstArray = firstString.ToCharArray();
        char[] secondArray = secondString.ToCharArray();

        int loop = Math.Min(firstArray.Length, secondArray.Length);
        bool check = true;

        //Solution

        for (int i = 0; i < loop; i++) // Check elements
        {
            if (firstArray[i] > secondArray[i])
            {
                check = false;
                Console.WriteLine(secondString);
                break;
            }
            else if (firstArray[i] < secondArray[i])
            {
                check = false;
                Console.WriteLine(firstString);
                break;
            }
        }

        if (check) // If elements are equal, check length
        {
            if (firstArray.Length > secondArray.Length)
            {
                Console.WriteLine(secondString);
            }
            else if (firstArray.Length < secondArray.Length)
            {
                Console.WriteLine(firstString);
            }
            else
            {
                Console.WriteLine("No difference");
            }
        }
    }
}