#include<bits/stdc++.h>
using namespace std;
int c[1000010];
int main()
{
	int a,b,s=0,y=0;
	cin>>a>>b;
	for(int i=a;i<=b;++i)
	{
		while(i!=0)
		{
		    s++;
			int g = i%10;
		    c[s] = g;
			sort(c+1,c+s+1);
	        if(c[1]==0&&c[s]==s-1)
	        {
	    	    y++;
		    }
			i/=10;
	    }
	}
	cout<<y;
	return 0;
}