Largest Common End

using System;
using System.Linq;


namespace Application
{
    class MainClass
    {
        protected internal static void Main()
        {
            string[] wordsOne = Console.ReadLine().Split(' ').ToArray();
            string[] wordsTwo = Console.ReadLine().Split(' ').ToArray();

            int leftCounter   = 0;
            int rightsCounter = 0;

            for (int i = 0; i < Math.Min(wordsOne.Length, wordsTwo.Length); i++)
            {
                if (wordsOne[i] == wordsTwo[i])
                {
                    leftCounter++;
                }
                else
                {
                    break;
                }
            }

            for (int i = 0; i < Math.Min(wordsOne.Length, wordsTwo.Length); i++)
            {
                if (wordsOne[wordsOne.Length - 1 -i] == wordsTwo[wordsTwo.Length - 1 - i])
                {
                    rightsCounter++;
                }
                else
                {
                    break;
                }
            }
            if (rightsCounter > leftCounter)
            {
                Console.WriteLine(rightsCounter);
            }
            else
            {
                Console.WriteLine(leftCounter);
            }
        }
    }
}