#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,cnt=0;cin>>a>>b;
	for(int i=a;i<=b;i++){
		int t=i,s=0;
		while(t){
			s+=1;
			t/=10;
		}
		if(s==2){
			int u=i;
			while(u){
				if(u==10){
					cnt++;
				}
				break;
			}	
		}else if(s==3){
			int u=i;
			if(u==102||u==120||u==201||u==210){
				cnt++;
			}
		}else if(s==4){
			int u=i;
			if(u==1023||u==1032||u==1203||u==1230||u==1302||u==1320||u==2013||u==2031){
				cnt++;
			} 
		}
	}
	cout<<cnt;
}