[Programming Fundamentals] (Arrays)- 01. Largest Common End

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

namespace _01.Largest_Common_End
    {
    class LargestCommonEnd
        {
        static void Main(string[] args)
            {
            string[] words1 = Console.ReadLine().Split().ToArray();
            string[] words2 = Console.ReadLine().Split().ToArray();
            int size = Math.Min(words1.Length, words2.Length);
            int length1 = words1.Length;
            int length2 = words2.Length;
            int countLeft = 0, countRight = 0;

            // CHECK LEFT side
            for (int i = 0; i < size; i++)
                {
                if (words1[i]==words2[i])
                    {
                    countLeft++;
                    }
                else
                    {
                    break;
                    }
                }

            // CHECK RIGHT side
            for (int i = 1; i < size; i++)
                {
                if (words1[length1-i]==words2[length2-i])
                    {
                    countRight++;
                    }
                else
                    {
                    break;
                    }
                }

            if (countLeft==0 && countRight==0)
                {
                Console.WriteLine(countLeft);
                }
            else
                {
                Console.WriteLine(Math.Max(countLeft,countRight));
                }


            } // End of Main
        }
    }