using System;

class Program
{
    static void Main()
    {
        string[] firstArray = Console.ReadLine().Split();
        string[] secondArray = Console.ReadLine().Split();

        int counter = 0;
        if (firstArray.Length < secondArray.Length)
        {
            for (int i = 0; i < firstArray.Length; i++)
            {
                if (firstArray[i] == secondArray[i])
                {
                    counter++;
                }
                else
                {
                    break;
                }
            }
        }
        else
        {
            for (int i = 0; i < secondArray.Length; i++)
            {
                if (firstArray[i] == secondArray[i])
                {
                    counter++;
                }
                else
                {
                    break;
                }
            }
        }
        if (firstArray.Length < secondArray.Length)
        {
            for (int i = firstArray.Length - 1 ; i >= 0 ; i--)
            {
                int arrayDifference = Math.Abs(firstArray.Length - secondArray.Length);
                if (firstArray[i] == (secondArray[i + arrayDifference]))
                {
                    counter++;
                }
                else
                {
                    break;
                }
            }
        }
        else
        {
            for (int i = secondArray.Length -1 ; i >= 0 ; i--)
            {
                int arrayDifference = Math.Abs(firstArray.Length - secondArray.Length);
                if (secondArray[i] == (firstArray[i + arrayDifference]))
                {
                    counter++;
                }
                else
                {
                    break;
                }
            }
        }
        Console.WriteLine(counter);
    }
}