#include <iostream>
using namespace std;
long long a,b;
int main ()
{
	cin>>a>>b;
	if(a==b)
	{
		if(a/10000000==b%10)
		{
			cout<<1;
		}
		else
		{
			cout<<0;
		}
	}
	else
	{
		cout<<3;
	}
	return 0;
}