#include "stdafx.h"
#include <iostream>

using namespace std;


int main()
{
	int number, l = 0;
	cin >> number;
	int copy = number;
	int mas[4] = { 0,0,0,0 };
	while (copy > 0)
	{
		copy /= 10;
		l++;
	}
	for (int i = 0; i < l; i++)
	{
		mas[i] = number % 10;
		number /= 10;
	}
	if ((mas[0] == mas[3]) && (mas[1] == mas[2]))
		cout << 1 << endl;
	else
		cout << 9 << endl;
	system("pause");
    return 0;
}