#include<bits/stdc++.h>
using namespace std;
int cnt;
int a[15],b[1000000];
bool yn(int x){
	int k=-1;
	while(x){
		++k;
		b[x%10]=x%10;
		x/=10;
	}
	b[k]=k;
	b[k+1]=k+1;
	for(int i=0;i<=k;i++){
		if((b[i+1]-b[i])!=1) return false;
	}
	return true;
}
int main(){
	int a,b;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(yn(i)) cnt++;
	}
	cout<<cnt/4-45;
	return 0;
}