#include<bits/stdc++.h>
using namespace std;
int main()
{
	int x,y;
	cin>>x>>y;
	if(x>=y)
	{
		cout<<0;
		return 0;
	}
	int b=y-x;
	int t=b/10;
	if(b%10!=0)
	{
		t++;
	}
	cout<<t; 
    return 0;
}