[Programming Fundamentals] - 01. Largest Common End-100/100

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

namespace _01.Largest_Common_End_1
    {
    class LargestCommonEnd
        {
        static void Main(string[] args)
            {
            string[] str1 = Console.ReadLine().Split().ToArray();
            string[] str2 = Console.ReadLine().Split().ToArray();

            //string[] str1 = { "hi", "php", "java", "csharp", "sql", "html", "css", "js" };
            //string[] str2 = { "hi", "php", "java", "js", "softuni", "nakov", "java", "learn" };

            //string[] str1 = { "hi", "php", "java", "xml", "csharp", "sql", "html", "css", "js" };
            //string[] str2 = { "nakov", "java", "sql", "html", "css", "js" };

            //Console.WriteLine(String.Join(" ", str1));
            //Console.WriteLine(string.Join(" ", str2));

            int len1 = str1.Length;
            int len2 = str2.Length;
            int j = 0;
            int countBegin = 0;
            int countEnd = 0;
            bool flagBegin = true;
            bool flagEnd = true;

            for (int i = 0; i < len1; i++)
                {
                // Checking BEGIN arr
                if (str1[i] == str2[j] && flagBegin)
                    {
                    countBegin++;
                    }
                else
                    {
                    flagBegin = false;
                    }

                // Checking END arr
                if (str1[len1 - 1 - i] == str2[len2 - 1 - j] && flagEnd)
                    {
                    countEnd++;
                    }
                else
                    {
                    flagEnd = false;
                    }

                j++;
                if (j == len2)
                    {
                    j = 0;
                    }

                }

            if (countBegin >= countEnd)
                {
                Console.WriteLine(countBegin);
                }
            else
                {
                Console.WriteLine(countEnd);
                }
            }
        }
    }