#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;

signed main(){
	//freopen("xxx.in","r",stdin);
	//freopen("xxx.out","w",stdout);
	ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	ll a,b,res=0;cin>>a>>b;
	for(ll i=a;i<=b;i++){
		string s;
		ll j=i;
		while(j){
			s+=(j%10+48);
			j/=10;
		}
		ll n=s.size();
		ll can=1;
		sort(s.begin(),s.end());
		for(int i=0;i<n;i++)if(s[i]!=i+48)can=0;
		res+=can;
	}
	cout<<res;
	return 0;
}