#include<bits/stdc++.h>
using namespace std;
bool isluckynumber(int n)
{
	int x=0;
	while(n>10)
	{
		if(n%10==x) return true;
		n=n/10;
		x++;
	}
	return false;
}
int main()
{
	int a,b;
	cin>>a>>b;
	int lucky=0;
	for(int i=a;i<=b;i++)
	{
		if(isluckynumber(i))
		{
			lucky++;
			
		}
	}
	cout<<lucky;
	
	return 0;
}