#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c=0;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		int x=i,s=0,cnt=0;
		while(x!=0){
			x/=10;
			s++;
		} 
		x=i;
		while(x!=0){
			int g=x%10;
			if(g<=s){
				cnt++;
			}
			x/=10;
		}
		if(cnt==s)c++;
	}
	cout<<c;
	return 0;
}