using System;
using System.Collections.Generic;
using System.Linq;
using Wintellect.PowerCollections;


namespace TestGround
{
    class Program
    {

        public static void Main()
        {
            string[] arr = Console.ReadLine().Split(' ');
            string[] arr2 = Console.ReadLine().Split(' ');

            int countFront = CountFront(arr, arr2);
            int countBack = CountBack(arr, arr2);

            Console.WriteLine(Math.Max(countFront, countBack));
        }

        private static int CountFront(string[] arr, string[] arr2)
        {
            int counter = 0;
            for (int i = 0; i < Math.Min(arr.Length, arr2.Length); i++)
            {
                if (arr[i] == arr2[i])
                {
                    counter++;
                }
                else
                {
                    break;
                }
            }
            return counter;
        }

        private static int CountBack(string[] arr, string[] arr2)
        {
            string[] bigger;
            string[] smaller;
            if (arr.Length >= arr2.Length)
            {
                bigger = arr;
                smaller = arr2;
            }
            else
            {
                bigger = arr2;
                smaller = arr;
            }
            int sizeDifference = bigger.Length - smaller.Length;
            int counter = 0;
            for (int i = bigger.Length - 1; i >= sizeDifference; i--)
            {
                if (bigger[i] == smaller[i - sizeDifference])
                {
                    counter++;
                }
                else
                {
                    break;
                }
            }
            return counter;
        }
    }
}