#include <bits/stdc++.h>
using namespace std;
int ans,a,b;
bool check(int n){
	int b=n,ws=0;
	while(b){
		ws++;
		b/=10;
	}
	ws--;
	int bb[9];
	memset(bb,false,sizeof(bb));
	while(n){
		bb[n%10]=true;
		n/=10;
	}
	for(int i=0;i<=ws;i++){
		if(bb[i]==0)return false;
	}
	return true;
}
int main()
{
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(check(i))ans++;
	}	
	cout<<ans;
	return 0;
}