01

using System;
using System.Linq;
using System.Collections.Generic;

namespace ExamPreparation
{
    class Startup
    {
        static void Main()
        {
            string[] firstTokens = Console.ReadLine().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
            string[] secondTokens = Console.ReadLine().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

            int startCount = 0;

            if (firstTokens.Length <= secondTokens.Length)
            {
                startCount = firstTokens.TakeWhile((element, index) => element == secondTokens[index]).Count();
            }
            else
            {
                startCount = secondTokens.TakeWhile((element, index) => element == firstTokens[index]).Count();
            }

            Array.Reverse(firstTokens);
            Array.Reverse(secondTokens);

            int endCount = 0;

            if (firstTokens.Length <= secondTokens.Length)
            {
                endCount = firstTokens.TakeWhile((element, index) => element == secondTokens[index]).Count();
            }
            else
            {
                endCount = secondTokens.TakeWhile((element, index) => element == firstTokens[index]).Count();
            }

            if (startCount >= endCount)
            {
                Console.WriteLine(startCount);
            }
            else
            {
                Console.WriteLine(endCount);
            }
        }
    }
}